29. what is the resulting ph after 15 ml of a 0.1 m hno3 solution is added to 200.0 ml of a buffer made of 0.25 m hf and 0.25 m naf? a. 5.07 b. 4.21 c. 4.09 d. 3.17 e. 3.12

Answers

Answer 1

The resulting pH after the 15 ml of the 0.1 M HNO₃ solution is added to 200.0 ml of the buffer of 0.25 M HF and 0.25 M NaF is 4.09. The correct option is c.

The chemical equation is as :

HNO₃ + HF → HF₂⁻ + NO₃⁻

The moles of  HNO₃ is:

Moles of  HNO₃ = 0.1 mol/L × 0.015 L

Moles of  HNO₃ = 0.0015 mol

The initial moles of the HF in buffer :

The moles of the HF = 0.25 mol/L × 0.2 L

The moles of the HF = 0.05 mol

The moles HF remaining = 0.05 mol - 0.0015 mol

                                          = 0.0485 mol

[HF] = 0.0485 mol / 0.2 L

[HF] = 0.2425 M

[F⁻] = 0.0015 mol / 0.2 L

[F⁻] = 0.0075 M

The expression for the Henderson-Hasselbalch equation is as :

pH = pKa + log([A-]/[HA])

pH = 3.17 + log(0.0075/0.2425)

pH  = 4.09

The correct option is c.

To learn more about pH here

https://brainly.com/question/31322044

#SPJ4


Related Questions

A respiratory disease characterized by decreased chloride ion diffusion out of cells and dehydrated respiratory secretions is a) bronchitis b) emphysema c) cystic fibrosis d) pulmonary fibrosis e) lung cancer

Answers

The respiratory disease characterized by decreased chloride ion diffusion out of cells and dehydrated respiratory secretions is cystic fibrosis. Option C is correct.

Cystic fibrosis is a genetic disorder that affects the exocrine glands, including those in the lungs, pancreas, and sweat glands. The condition causes a thick and sticky mucus to build up in the lungs, making breathing difficult and increasing the risk of respiratory infections.

The decreased chloride ion diffusion out of cells is due to a defect in the cystic fibrosis transmembrane conductance regulator (CFTR) protein, which is responsible for controlling the movement of salt and water in and out of cells. This results in dehydrated respiratory secretions, as well as thick and sticky mucus in other organs. While there is no cure for cystic fibrosis, treatment focuses on managing symptoms and preventing complications. Hence Option C is correct.

To learn more about cystic fibrosis, here

https://brainly.com/question/30754172

#SPJ4

if 3.50 mol of an ideal gas has a pressure of 2.68 atm and a volume of 75.71 l, what is the temperature of the sample in degrees celsius?

Answers

The temperature of the sample of gas is 432.45 °C.

What is temperature?

We can use the ideal gas law, which states:

PV = nRT

where:

P = pressure (in atm)

V = volume (in L)

n = number of moles

R = gas constant (0.0821 L·atm/(mol·K))

T = temperature (in K)

First, we need to convert the given volume to liters (since the unit of R is in L).

75.71 L = 75.71 L

Next, we can substitute the given values into the ideal gas law and solve for T:

2.68 atm x 75.71 L = 3.50 mol x 0.0821 L·atm/(mol·K) x T

202.6328 L·atm = 0.28735 mol·K·T

T = (202.6328 L·atm) / (0.28735 mol·K) = 705.6 K

Finally, we can convert the temperature from Kelvin to Celsius by subtracting 273.15:

T = 705.6 K - 273.15 = 432.45 °C

Therefore, the temperature of the sample of gas is 432.45 °C.

What is ideal gas law?

The ideal gas law is a fundamental principle in physics and chemistry that describes the behavior of a hypothetical ideal gas. The ideal gas law is expressed mathematically as:

PV = nRT

The ideal gas law describes the relationship between the pressure, volume, temperature, and number of moles of an ideal gas. An ideal gas is a theoretical gas composed of a large number of randomly moving particles that do not interact with one another, except through perfectly elastic collisions. In reality, no gas behaves exactly like an ideal gas, but many gases behave approximately like an ideal gas under certain conditions.

To know more about temperature, visit:

https://brainly.com/question/31084622

#SPJ1

Darlene is a dancer with ankle pain and a considerable amount of swelling. She
MOST LIKELY has what muscle disorder?

Answers

Answer is Strain

Strain is a tear in a muscle as a result of excessive use that results in a minimal bleeding inside the muscle, pain and swelling

consider the following solubility products: salt ksp at 25 degrees c pbcl2 1.6 x 10-5 pbi2 1.4 x 10-8 pb(oh)2 1.2 x 10-15 which lead salt would you expect to be the most soluble in water at 25 degrees c?

Answers

The solubility product constant (Ksp) is a measure of the solubility of a sparingly soluble salt. A larger Ksp value indicates a higher solubility of the salt in water.

Comparing the Ksp values given, we can see that [tex]PbCl_{2}[/tex] has the largest Ksp value (1.6 x [tex]10^-5[/tex] ) among the three lead salts. This means that [tex]PbCl_{2}[/tex] has the highest solubility among the three salts at 25 degrees Celsius.

On the other hand, Pbi2 has a much smaller Ksp value (1.4 x 10^-8), indicating that it has a much lower solubility in water at 25 degrees Celsius. [tex]Pb(OH)_{2}[/tex] has an even smaller Ksp value (1.2 x 10^-15), making it the least soluble of the three salts.

It is important to note that factors such as temperature, pressure, and pH can also affect the solubility of a salt. However, based on the given information, we can conclude that [tex]PbCl_{2}[/tex] would be the most soluble of the three lead salts in water at 25 degrees Celsius.

Learn more about  Ksp value

https://brainly.com/question/13032436

#SPJ4

4. The elements calcium and strontium have similar chemical properties because they both have the same
A) atomic number
B) mass number
C) number of valence electrons
D) number of completely filled sublevels​

Answers

Answer: option C

Explanation: As they belong to same group

According to the following equation, how many grams of nitrogen dioxide must react with
water to produce 2.25 g of nitric acid (HNO₂)?
2 NO₂ + H₂O → HNO₂+ HNO3

Answers

3.29 grams of nitrogen dioxide must reaction  with water to produce 2.25 g of nitric acid According to the following equation,

What processes produce NO and NO2?

When oxygen and nitrogen interact at high temperatures in the atmosphere, NO and NO2 are both produced. Both the emissions of power generation plants and the exhaust fumes from vehicles and trucks are significant sources of nitrogen oxides.

How is nitrogen dioxide, or n2o, created?

In the process of creating chemicals like nitric acid, that's utilized to create synthetic commercial fertiliser, and adipic acid, that's utilized to create fibres like nylon and other synthetic items, nitrous oxide is produced as a byproduct. Waste.

To know more about reaction visit:

https://brainly.com/question/28984750

#SPJ1

when 0.0507 moles of iron(iii) chloride are dissolved in enough water to make 480 milliliters of solution, what is the molar concentration of chloride ions? answer in units of mol/l.

Answers

The molar concentration of chloride ions in the solution is 0.3169 mol/L

To find the molar concentration of chloride ions in the solution, we need to consider the mole-to-ion ratio of iron(III) chloride (FeCl₃) and then use the volume of the solution.

1 mole of FeCl₃ dissociates into 3 moles of chloride ions (Cl⁻) in solution. So, for 0.0507 moles of FeCl₃, the number of moles of Cl⁻ ions will be:

0.0507 moles FeCl₃ × (3 moles Cl⁻ / 1 mole FeCl₃) = 0.1521 moles Cl⁻

Now, we have 480 milliliters of solution, which is equivalent to 0.480 liters. To find the molar concentration of chloride ions, divide the moles of Cl⁻ by the volume of the solution in liters:

0.1521 moles Cl⁻ / 0.480 L = 0.3169 mol/L

So, the molar concentration of chloride ions in the solution is 0.3169 mol/L.

Know more about   molar concentration   here:

https://brainly.com/question/26255204

#SPJ11

Kinetic molecular theory says that as water molecules absorb energy, their motion and temperature __________ and the sample becomes ___________.
Responses
A expand, largerexpand, larger
B decrease, soliddecrease, solid
C stays the same, smallerstays the same, smaller
D increase, warm

Answers

Kinetic molecular theory says that as water molecules absorb energy, their motion and temperature increase and the sample becomes warm

What can we infer about the impact of temperature from the kinetic theory of molecules?

The average kinetic energy of the molecules will rise as the temperature rises, according to the kinetic molecular theory. The edge of the container will probably be more frequently struck by the particles as they travel more quickly.

The average molecular velocity of a gas increases as its temperature rises; for example, doubling the temperature will result in a four-fold increase in molecular velocity. More momentum and kinetic energy will be transferred to the container's walls in collisions with them.

learn more about kinetic molecular theory

https://brainly.com/question/134712

#SPJ1

Which has more atoms: one mole of helium or one mole of lead?

Answers

Answer:

They're equal.

Explanation:

Giving an idea let's use the question:

How big would a box be that holds one mole of helium?

This would depend on the temperature and pressure conditions that the helium gas is being stored under.

You see, gases have no fixed volume. They will expand when the temperature increases and/or the applied pressure decreases. On the other hand, the gas will contract when cooled or pressure is applied. So one mole of helium could occupy almost any volume, depending on how much you compress it or how cool you keep it.

However, if your helium gas is stored under standard temperature and pressure conditions (STP)(0 C and 101.3 kPa), then it would fill a box with a volume of 22.4 L. This volume is known as the standard molar volume and is the same for any gas at STP.

I will let you come up with a set of dimensions for a box that could satisfy this volume.

the sds for 1-octanol is provided here. (links to an external site.) is 1-octanol a combustible liquid?

Answers

True. 1-octanol is a combustible liquid with a flashpoint of 86°C and an auto-ignition temperature of 258°C, according to the provided SDS.

The SDS (Safety Data Sheet) for 1-octanol indicates that it is a combustible liquid. According to the SDS, 1-octanol has a flashpoint of 86°C (187°F) and an auto-ignition temperature of 258°C (496°F). These values suggest that 1-octanol can easily ignite in the presence of an ignition source and may burn at relatively low temperatures. Additionally, the SDS provides information on the fire and explosion hazards associated with 1-octanol and recommends appropriate handling procedures and precautions to minimize the risk of fire or explosion. Therefore, it is important to handle 1-octanol with care and follow appropriate safety protocols when working with this substance.

To learn more about combustible liquid, refer:

https://brainly.com/question/28222891

#SPJ4

The complete question is:

the SDS for 1-octanol is provided here. (links to an external site.) is 1-octanol a combustible liquid? True or False.

an unknown quantity of gas takes up 30.7 liters at a pressure of 1.58 atm and a temperature of 93.4oc. how many moles are in the gas sample?

Answers

An unknown quantity of gas takes up 30.7 liters at a pressure of 1.58 atm and a temperature of 93.4oc. There are approximately 1.94 moles of gas in the sample.

To find the number of moles in the gas sample, we can use the ideal gas law, which states that PV = nRT, where P is the pressure, V is the volume, n is the number of moles, R is the gas constant, and T is the temperature in Kelvin.

First, we need to convert the given temperature of 93.4oC to Kelvin. This can be done by adding 273.15 to the Celsius temperature, giving us a temperature of 366.55 K.

Next, we can plug in the given values and solve for n:

(1.58 atm) (30.7 L) = n (0.08206 L·atm/mol·K) (366.55 K)

Simplifying this equation gives us:

n = (1.58 atm) (30.7 L) / (0.08206 L·atm/mol·K) (366.55 K)

n = 1.94 mol


It is important to note that the ideal gas law is based on certain assumptions, including that the gas is in a state of equilibrium and that the molecules are not interacting with each other. In real-world situations, these assumptions may not hold, and other gas laws or equations may need to be used.

know more about pressure here

https://brainly.com/question/29341536#

#SPJ11

q23.42 - level 3 homeworkanswereddue apr 12th, 11:30 am which combination of reactants will produce levulinic acid, which is used by the tobacco industry to make nicotine more addictive?

Answers

Levulinic acid can be produced from various reactants, including biomass and sugars such as glucose, fructose, and sucrose.

The following combination of reactants could be used to produce levulinic acid:

Fructose or glucose (monosaccharides)Sulfuric acid or hydrochloric acid (catalysts)

However, in terms of the tobacco industry, levulinic acid is commonly produced from tobacco leaves themselves. The leaves are subjected to a process called acid hydrolysis, which breaks down the cellulose and hemicellulose in the plant material into sugars. These sugars are then used as reactants in the production of levulinic acid, which is used to make nicotine more addictive.

Levulinic acid is used by the tobacco industry to make nicotine more addictive by converting it into a more stable and absorbable form. It is important to note, however, that nicotine addiction is a serious health concern and should be addressed through education and smoking cessation programs rather than through the manipulation of nicotine chemistry.

Learn more about acid hydrolysis here:

https://brainly.com/question/29622274

#SPJ11

A 2.06 g solid sample of an unknown monoprotic acid was dissolved in distilled
water to produce a 35.0 mL solution at 25°C. This solution was then titrated with
0.300 M NaOH. The equivalence point was reached when 48.73 mL of 0.300 M
NaOH were delivered.
a. Find the number of moles of acid in the solid sample.
b. Find the molar mass of the unknown acid.

Answers

the molar mass of the unknown acid is approximately 141.1 g/mol.

a. To find the number of moles of acid in the solid sample, we first need to calculate the number of moles of NaOH used in the titration. We can do this using the equation:

moles NaOH = M NaOH x V NaO

where M NaOH is the molarity of the NaOH solution, and V NaOH is the volume of NaOH solution used at the equivalence point.

Substituting the given values, we get

moles NaOH = 0.300 mol/L x 0.04873 L = 0.014619 mol

Since NaOH and the unknown acid react in a 1:1 mole ratio, the number of moles of acid in the sample is also 0.014619 mol.

b. To find the molar mass of the unknown acid, we can use the equation

molar mass = mass of sample / number of moles of acid

Substituting the given values, we get:

molar mass = 2.06 g / 0.014619 mol = 141.1 g/mol

Learn more about molar  here:

https://brainly.com/question/8732513

#SPJ11

The number of moles in the acid is 0.014619 moles and the molar mass of the unknown monoprotic acid is 140.92 g/mol.

How to calculate the number the moles in acid?



To find the number of moles of acid in the solid sample, first determine the moles of NaOH used in the titration. You can do this using the formula:

moles = volume (L) × concentration (M)
moles of NaOH = 48.73 mL × (1 L / 1000 mL) × 0.300 M = 0.014619 moles

Since it's a monoprotic acid, the moles of the acid are equal to the moles of NaOH at the equivalence point:
moles of acid = 0.014619 moles

b. To find the molar mass of the unknown acid, use the formula:

molar mass = mass of the sample (g) / moles of the acid
molar mass = 2.06 g / 0.014619 moles = 140.92 g/mol

So, the molar mass of the unknown monoprotic acid is approximately 140.92 g/mol.

To know more about Molar Mass:

https://brainly.com/question/29509963

#SPJ11

Calculate the ΔH for this reaction: C₂H4 (g) + H₂ (g) → C₂H6 (g). (10 points)
ΔH°f C₂H4 (g) = 52.5 kJ/mol
ΔH°f C₂H6 (g) = -84.7 kJ/mol

Answers

The enthalpy of the reaction as seen from the calculations is - 137.2 kJ/mol.

What is the enthalpy change of the reaction?

To determine the enthalpy change of a reaction, we need to know the difference between the enthalpy of the products and the enthalpy of the reactants. This difference is known as the enthalpy change or the heat of reaction.

The enthalpy change of a reaction can be calculated using the following formula:

ΔH = ΣnΔHf(products) - ΣmΔHf(reactants)

where ΔH is the enthalpy change of the reaction, n and m are the stoichiometric coefficients of the products and reactants, respectively, and ΔHf is the standard enthalpy of formation of the species.

Enthalpy of reaction = Enthalpy of products - Enthalpy of reactants

(-84.7) -(52.5 + 0)

- 137.2 kJ/mol

Learn more about enthalpy change:https://brainly.com/question/29556033

#SPJ1

Define ΔHrxn and ΔHf. Which Part of the experiment demonstrated the change in enthalpy per mole of a reaction? Which Part of the experiment demonstrated the standard molar enthalpy of formation for a reaction?

Answers

ΔHrxn and ΔHf are measured by heat transfer in experiments. ΔHrxn measures enthalpy change per mole of a reaction, while ΔHf measures heat released when one mole of a compound forms from its elements in standard states. Experimentally, ΔHrxn measures change in enthalpy per mole of a reaction and ΔHf measures standard molar enthalpy of formation.

ΔHrxn is the change in enthalpy of a chemical reaction, which is measured at constant pressure and can be either endothermic (positive ΔHrxn) or exothermic (negative ΔHrxn).

ΔHf, on the other hand, is the standard molar enthalpy of formation, which is the enthalpy change that occurs when one mole of a compound is formed from its constituent elements in their standard states (most stable form at standard temperature and pressure).

In an experiment to measure ΔHrxn, the enthalpies of the reactants and products are measured directly and the difference is calculated. This can be done using calorimetry, where the heat transfer of the reaction is measured using a calorimeter. In an experiment to measure ΔHf, the enthalpy of a single reaction is measured and the number of moles of reactants used is known.

The part of the experiment that demonstrates the change in enthalpy per mole of a reaction would be the part where the enthalpy change is measured directly, which is used to calculate ΔHrxn. The part of the experiment that demonstrates the standard molar enthalpy of formation for a reaction would be the part where the number of moles of reactants used is known and the initial and final masses of the reactants and products are measured, which is used to calculate ΔHf.

To know more about enthalpy, here

brainly.com/question/13996238

#SPJ4

--The complete question is, What is the difference between ΔHrxn and ΔHf, and how are they measured experimentally? In an experiment to measure the enthalpy change of a reaction and the standard molar enthalpy of formation, which parts of the experiment would demonstrate each of these quantities?--

5. referring to the article of the crystal structure of acetylsalicylic acid published by j.d. bauer et. al in 2010. what solvent was used to grow the crystals?5. referring to the article of the crystal structure of acetylsalicylic acid published by j.d. bauer et. al in 2010. what solvent was used to grow the crystals?

Answers

According to the article published by J.D. Bauer et. al in 2010, the solvent used to grow the crystals of acetylsalicylic acid was ethanol.

The process of crystal growth involves dissolving the compound in a suitable solvent and then allowing it to slowly evaporate under controlled conditions to form well-defined crystals. Ethanol is a commonly used solvent for the growth of crystals due to its ability to dissolve a wide range of compounds, including organic molecules like acetylsalicylic acid.

The use of ethanol as a solvent for crystal growth of acetylsalicylic acid was carefully chosen to ensure that the crystals formed were of high quality and had a well-defined crystal structure. The crystal structure of acetylsalicylic acid is important because it determines the physical and chemical properties of the compound.


In conclusion, the use of ethanol as a solvent for the growth of acetylsalicylic acid crystals was a crucial step in the determination of the crystal structure of this important compound. The choice of solvent is an important factor to consider when growing crystals, as it can greatly affect the quality and properties of the crystals formed.

Know more about   ethanol   here:

https://brainly.com/question/281073

#SPJ11

the mantle can be separated into two different portions: the lower mantle and the upper mantle. the lower mantle is

Answers

The mantle can be separated into two different portions: the lower mantle and the upper mantle. The lower mantle is: completely solid due to extreme pressure that prevents iron-rich silica rocks from melting.

The majority of the interior of the Earth is made up of the mantle. The Earth's narrow crust and dense, very hot core are separated by the mantle. Approximately 2,900 kilometres (1,802 miles) deep, the mantle accounts for an astounding 84 percent of the volume of the planet.

Iron and nickel swiftly separated from other rocks and minerals when Earth started to take shape around 4.5 billion years ago, forming the planet's core. The early mantle was the molten material that encircled the core.

Mantle cooling occurred over millions of years. "Outgassing" is the process of water contained inside minerals erupting with lava. The mantle solidified as more water was outgassed.

Learn more about Mantle:

https://brainly.com/question/10758534

#SPJ4

The mantle, Earth's thickest layer, can be separated into two distinct portions: the lower mantle and the upper mantle. The lower mantle is situated below the upper mantle and extends from about 660 km to 2,890 km in depth. It consists of denser, high-pressure minerals, and has a more sluggish, less fluid behavior compared to the upper mantle. This portion plays a crucial role in the Earth's internal heat transfer and overall geodynamics.

The mantle, which is located between the Earth's crust and core, can be divided into two distinct sections: the lower mantle and the upper mantle. The lower mantle is the portion of the mantle that extends from a depth of 660 kilometers (410 miles) to the boundary between the mantle and the Earth's core, which is roughly 2,891 kilometers (1,800 miles) deep. It is composed of dense, solid rock and is the Earth's largest layer. The lower mantle is thought to play a critical role in the dynamics of the Earth's interior, including the formation of hotspots and the movement of tectonic plates.

Learn more about The mantle here: brainly.com/question/28827790

#SPJ11

Recall all the atomic models you described in task 1. Think about the results each model would predict for Rutherford’s gold foil experiment. Which atomic models does Rutherford’s experimental evidence support? Explain why these models are compatible with the experimental results.


The models in task 1 were Dalton's, Thomson's, Rutherford's, and Bohr's

Answers

The atomic models does the Rutherford’s experimental evidence as the support is the Bohr's model.

The Rutherford's theory plays the role upon which the Bohr's model is explained. The Rutherford describes the fact at which the center of the atom, and there is the nucleus and whose radius will be the smaller than that of the radius of the atom. The nucleus is the positively charged and the most of  mass of the atom are concentrated in it. The Electrons revolves round this nucleus in the orbits.

The experimental evidences that of the Bohr's model which shows that the Rutherford's model was the fundamentally correct.

To learn more about atomic models here

https://brainly.com/question/11776177

#SPJ4

what is the concentration in ppm of a solution containing 0.35 mg of fluoride and 63 ml of tap water?

Answers

The concentration of the solution is approximately 5,556 ppm of fluoride in the tap water.

How to find the concentration of a solution?

To calculate the concentration of a solution in parts per million (ppm), you need to know the mass of the solute (in milligrams) and the volume of the solution (in milliliters).

Given: Mass of fluoride (solute) = 0.35 mg, Volume of tap water (solution) = 63 ml

The formula to calculate concentration in ppm is:

Concentration (ppm) = (Mass of solute / Volume of solution) x 1,000,000

1. Convert the mass of fluoride to grams: 0.35 mg = 0.00035 g
2. Convert the volume of tap water to liters: 63 mL = 0.063 L
3. Calculate the concentration in ppm using the formula: (mass of solute/volume of solution) x 1,000,000
4. Plug in the values: (0.00035 g / 0.063 L) x 1,000,000

Concentration (ppm) = 5,555.56 ppm (rounded to the nearest hundredth)

To know more about Concentration:

https://brainly.com/question/27347818

#SPJ11

what purpose does febr3 when benzene undergoes an electrophilic aromatic substitution reaction with bromine?

Answers

FeBr3 is crucial for the electrophilic aromatic substitution reaction between benzene and bromine as it helps generate a stronger electrophile, Br+, which can effectively attack the benzene ring.

FeBr3 (iron(III) bromide) is a catalyst used in electrophilic aromatic substitution reactions. When benzene reacts with bromine, the FeBr3 catalyzes the reaction by activating the bromine molecule towards an electrophilic attack. This means that FeBr3 facilitates the formation of a positive bromine ion, which can then attack the electron-rich benzene ring. The FeBr3 also helps to stabilize the intermediate carbocation formed during the reaction. This catalytic process allows for a faster and more efficient reaction between benzene and bromine, ultimately leading to the formation of bromobenzene.
FeBr3 (iron(III) bromide) plays a crucial role in the electrophilic aromatic substitution reaction between benzene and bromine. Its purpose is to act as a catalyst that generates a stronger electrophile, Br+, by forming a complex with bromine.
Here are the steps in the reaction:
1. Formation of the electrophile: FeBr3 reacts with bromine (Br2), generating the electrophile Br+ and FeBr4-.
  FeBr3 + Br2 → Br+ + FeBr4-
2. Electrophilic attack: The electrophile Br+ attacks the benzene ring, creating a positively charged cyclohexadienyl cation (sigma complex) by breaking one of the pi bonds.
3. Deprotonation: A base (usually the FeBr4- ion generated in step 1) abstracts a hydrogen atom from the cyclohexadienyl cation, restoring the aromaticity of the benzene ring and forming the bromobenzene product.
  Cyclohexadienyl cation + FeBr4- → Bromobenzene + HFeBr4

To leran more about electrophilic aromatic substitution reaction, refer:-

https://brainly.com/question/30761476

#SPJ11

The purpose of [tex]FeBr_3[/tex] (iron(III) bromide) in an electrophilic aromatic substitution reaction, when benzene undergoes a reaction with bromine, is to act as a catalyst and generate the electrophile required for the reaction to occur.

[tex]FeBr_3[/tex], being a Lewis acid, accepts a lone pair of electrons from a bromine molecule [tex](Br_2)[/tex], forming a complex[tex][FeBr_3Br][/tex]. This complex then dissociates, generating the electrophile [tex]Br^+[/tex] and the [tex]FeBr_4^-[/tex]ion.

The electrophile [tex]Br^+[/tex] attacks the benzene ring, forming a new [tex]C-Br[/tex] bond through an electrophilic aromatic substitution reaction.

After the reaction, the [tex]FeBr_4^-[/tex] ion donates its [tex]Br^-[/tex] back to the reaction and regenerates the [tex]FeBr_3[/tex] catalyst.

In summary, [tex]FeBr_3[/tex]  serves the purpose of catalyzing the electrophilic aromatic substitution reaction between benzene and bromine by generating the necessary electrophile [tex](Br^+)[/tex] and facilitating the formation of the [tex]C-Br[/tex] bond.

To know more about catalyst refer here:

https://brainly.com/question/12260131#

#SPJ11

How many moles of caffeine, c8h10o2n4, are contained in a 100. Mg sample of caffeine? group of answer choices 0. 0085 0. 019 0. 51 0. 0028 0. 52

Answers

The number of moles of caffeine is 0.00052 mol

To calculate the number of moles of caffeine in a 100 mg sample, we need to use the formula:

moles = mass / molar mass

The molar mass of caffeine (C₈H₁₀O₂N₄) is 194.19 g/mol. Converting the mass of the sample to grams (100 mg = 0.1 g), we can plug in the values and solve for moles:

moles = 0.1 g / 194.19 g/molmoles = 0.00052 mol

The mole is widely used in stoichiometry calculations, which involve determining the amount of reactants needed to produce a certain amount of products or the amount of products produced from a certain amount of reactants. It is also used in the calculation of molar mass, which is the mass of one mole of a substance, and in the conversion between mass, moles, and number of entities in chemical reactions. Therefore, the number of moles of caffeine in a 100 mg sample of caffeine is 0.00052 moles.

To learn more about moles, here

https://brainly.com/question/26416088

#SPJ4

a sample of ozone gas occupies 225 ml at 1.00 atm and 0c if the volume of the gas is 625ml at 25c what is the pressure

Answers

To solve this problem, we can use the combined gas law formula, which is (P1 * V1) / T1 = (P2 * V2) / T2. Given the initial and final conditions of ozone gas, we need to find the pressure (P2) at 625 mL and 25°C.

Initial conditions:
P1 = 1.00 atm
V1 = 225 mL
T1 = 0°C + 273.15 = 273.15 K (convert to Kelvin)

Final conditions:
V2 = 625 mL
T2 = 25°C + 273.15 = 298.15 K (convert to Kelvin)
P2 = ? (This is the pressure we need to find)

Using the combined gas law formula, we get:

(1.00 atm * 225 mL) / 273.15 K = (P2 * 625 mL) / 298.15 K

Now, solve for P2:

P2 = (1.00 atm * 225 mL * 298.15 K) / (273.15 K * 625 mL)
P2 ≈ 0.659 atm

The pressure of the ozone gas at 625 mL and 25°C is approximately 0.659 atm.

Visit here to learn more about gas law   : https://brainly.com/question/27009857
#SPJ11

During a science class investigation, a teacher places a small amount of sugar in a beaker and then heats it over a candle. Which of the following would be the best evidence that a change in the chemical properties of the sugar has taken place?

Answers

The correct option is D. A gas is released and a black solid forms.

What proof is there that the burning of sugar involves a chemical reaction?

Carbon, hydrogen, and oxygen atoms make up sugar. When heated over a candle, these materials react with the fire and turn into liquids. Heat causes the sugar's atoms to interact with the oxygen in the air, forming new atomic groups. Energy is released during this chemical reaction in the form of smoke and black soot.

What happens chemically when sugar is consumed?

The main functions of sugars include their ability to sweeten things, maintain and intensify flavours, act as antioxidants and preservatives, and interact with water to change how it behaves. Fermentation, caramelization, Maillard reactions, or the creation of browning compounds, are examples of chemical processes.

To know more about solid visit:-

https://brainly.com/question/17061172

#SPJ1

Question:

During a science class investigation, a teacher places a small amount of sugar in a beaker and then heats it over a candle. Which of the following would be the best evidence that a change in the chemical properties of the sugar has taken place?

A. The sugar changes color.

B. The sugar dissolves in the water.

C. The sugar melts and turns into a liquid.

D. A gas is released and a black solid forms.

if you theoretically performed the bromination of phenol with only one equivalent of br2 which product do you think would predominate

Answers

The product that would predominate in the bromination of phenol with only one equivalent of Br2 is the para-bromophenol.

If the bromination of phenol was performed with only one equivalent of Br2, it is more likely that the para product would predominate due to steric hindrance effects that make it difficult for the ortho product to form. The reaction of phenol with Br2 is an electrophilic aromatic substitution where Br+ attacks the electron-rich aromatic ring.

The ortho position is sterically hindered by the presence of the bulky -OH group, making it difficult for the incoming Br+ ion to attack this position. On the other hand, the para position is less hindered, and the incoming Br+ ion can easily attack this position, leading to the predominance of the para product.

Although some ortho product may still form due to the statistical probability of the reaction, it would not be as significant as the para product.

To learn more about bromination of phenol, here

https://brainly.com/question/31325887

#SPJ4

The complete question is:

Had you performed the bromination of phenol with only one equivalent of Br2, which product (ortho or para) do you think would predominate? Hint: think about probability and statistics.

Please helppppp!!! Like quick pleaseee

Answers

Container | Bodies | Cylinders | Tires | Engines | Max. Number of Completed Cars | Limiting Part

A | 3 | 10 | 9 | 2 | 2 | Engines

B | 50 | 12 | 50 | 5 | 2 | Cylinders

C | 16 | 16 | 16 | 16 | 2 | Cylinders

D | 4 | 9 | 16 | 6 | 1 | Engines

E | 20 | 36 | 40 | 24 | 4 | Engines

How to determine amount of race car parts?

8. For container B, the limiting part is the cylinders, since only 12 cylinders are available and each car requires 8 cylinders. Therefore, the maximum number of complete cars that can be built is 12/8 = 1.5, or 1 car.

For container C, all parts are equal and no part limits the number of cars that can be built. The maximum number of complete cars that can be built is limited by the number of cylinders, which is 16. Each car requires 8 cylinders, so we can make a maximum of 16/8 = 2 complete cars.

For container D, the limiting part is the engines, since only 6 engines are available and each car requires 1 engine. Therefore, the maximum number of complete cars that can be built is 6.

For container E, the limiting part is the engines, since only 24 engines are available and each car requires 1 engine. Therefore, the maximum number of complete cars that can be built is 24.

Each group member should show their work for the container(s) they were responsible for and explain how they determined the limiting part.

9. a. To determine the number of race cars the Zippy Race Car Company can build, we need to find the limiting part. Since the inventory of each part is given in "oodles," we don't need to know the exact number of parts in an oodle to determine which part is limiting.

We can see that we have enough bodies and tires to build more than 8 oodles of cars, but we only have enough cylinders to build 5 oodles and enough engines to build 8 oodles. Therefore, the limiting part is the cylinders, and the maximum number of complete cars that can be built is 5 oodles.

b. It is not necessary to know the number of parts in an "oodle" because we are only comparing the quantities of each part to determine which one is limiting. The actual number of parts in an oodle doesn't matter as long as we know the relative quantities of the parts.

10. No, the component with the smallest number of parts is not always the one that limits production. In Question 8, for example, container C has an equal number of each part, but the number of cylinders limits production. It depends on the ratio of the quantities of each part needed to make a complete product, as well as the total quantity of each part available.

Find out more on limiting reagents here: https://brainly.com/question/14222359

#SPJ1

which of the following processes is not spontaneous? select one: a. a smoker's smokes gathers around the smoker. b. a woman enters a room. shortly thereafter her perfume can be smelled by those on the other side of the room. c. leaves decay. d. a lighted match burns. e. water evaporates from an open container on a dry day (low humidity).

Answers

A woman enters the room, so choice (b) is accurate. Immediately after, individuals on the opposite side of the room may smell her perfume.

Why can we smell the perfume that someone inside the space sprayed?

Diffusion: When fragrance particles mingle with air particles. The odorous gas's particles are free to move fast in any direction due to diffusion. So, a room fills with the scent of perfume.

What causes you to think someone has just left the room?

We can smell perfume when we open a bottle of it in a room, even from a fair distance away. This is due to the perfume's gas moving from high concentration areas to low concentration areas when the bottle is opened.

To know more about smell visit:-

https://brainly.com/question/14454576

#SPJ1

Assume we have 759 liters of N, at ST. What is the mass of the nitrogen gas? Give answers to the nearest whole number.

Answers

So, at STP, there are around 891 grammes of nitrogen gas in every 759 litres.

Which mass is greater, 14 or 15?

The two stable isotopes of naturally occurring nitrogen (7N) are nitrogen-14 and nitrogen-15, with nitrogen-14 constituting 99.6% of all naturally existing nitrogen. Along with one nuclear isomer, 11mN, fourteen radioisotopes with atomic masses ranging from 10 to 25 are also known.

Assuming "ST" refers to standard temperature and pressure (0°C and 1 atm), we can use the ideal gas law to calculate the mass of nitrogen gas:

PV = nRT

where n is the number of moles, P is the pressure, V is the volume, and T is the temperature, and R is the gas constant.

The temperature and pressure are 273.15 K and 1 atm, respectively, at STP.

To solve for n, the number of moles, we can rearrange the ideal gas law equation as follows:

n = PV / RT = (1 atm) * (759 L) / (0.0821 L·atm/(mol·K) * 273.15 K) = 31.8 mol

Now we can calculate the mass of nitrogen gas:

mass = n * molar mass = 31.8 mol * 28.01 g/mol ≈ 891 g.

To know more about nitrogen gas visit:-

https://brainly.com/question/13907528

#SPJ1

who thought that everything in the world was either substance or a characteristic of substance?

Answers

The philosopher who thought that everything in the world was either a substance or a characteristic of substance was Aristotle. He believed that substances were the fundamental entities of the world, and their properties were characteristics of these substances.

The philosopher Aristotle is credited with the belief that everything in the world was either a substance or a characteristic of the substance. He believed that substances were the basic building blocks of reality and that all other things, such as qualities or quantities, were dependent on substances for their existence. This belief has significantly influenced Western philosophy and continues to be discussed and debated today.

Learn more about characteristics of substances at https://brainly.com/question/4916153

#SPJ11

The philosopher Aristotle believed that everything in the world was either a substance or a characteristic of the substance.

He argued that substances were the fundamental building blocks of reality, while characteristics were the properties or attributes that substances possessed. According to Aristotle, substances were the primary entities in the world, and all other things could be explained in terms of their relationship to substances.

According to Aristotle, substances were the fundamental entities that made up reality, and characteristics, or "accidents," were the qualities that could be attributed to substances. This view became influential in the Western philosophical tradition and was the dominant way of thinking about ontology for many centuries.

To learn more about substance, refer:-

https://brainly.com/question/8242848

#SPJ11

an important property of water is its ability to act as a good solvent. this is best explained by water's: quilet

Answers

Water's ability to act as a good solvent is best explained by its polar nature. Water molecules are composed of two hydrogen atoms covalently bonded to an oxygen atom.

The oxygen atom has a higher electronegativity than the hydrogen atoms which gives the water molecule a slightly negative charge on the oxygen side and a slightly positive charge on the hydrogen side.

This polarity allows water molecules to interact with other polar molecules, forming hydrogen bonds and allowing them to dissolve a variety of substances. The hydrogen bonds form between the oxygen of one molecule and the hydrogen of another, allowing water molecules to surround and interact with the molecules of the substance being dissolved.

This polarity also allows water molecules to move freely making them highly mobile, allowing them to form a homogeneous solution with the dissolved substances. This ability of water to dissolve a variety of substances is what makes it a good solvent.

Know more about Electronegativity here

https://brainly.com/question/17762711#

#SPJ11

Glucose, C6H12O6, is best described as a(n) ______. compound. Which of the following is NOT a property of water? It is denser when frozen than when liquid.

Answers

a. Glucose, C6H12O6, is best described as a carbohydrate compound.

b. The statement that is NOT a property of water is "It is denser when frozen than when liquid." Option 1 is the correct answer.

Carbohydrates are organic compounds composed of carbon, hydrogen, and oxygen atoms in a ratio of approximately 1:2:1.

In fact, water is less dense when frozen than liquid, which is why ice floats on liquid water.

This is due to the unique property of water in which its molecules form a crystal lattice structure when frozen, which causes them to be more spread out and less dense than in the liquid state.

This property is important in aquatic ecosystems as it allows ice to float on top of bodies of water, preventing them from freezing solid and allowing life to continue below the surface.

Learn more about glucose at

https://brainly.com/question/30548064

#SPJ4

The question is -

Answer the following questions -

a. Glucose, C6H12O6, is best described as a(n) ______. compound.

b. Which of the following is NOT a property of water?

Options are -

1. It is denser when frozen than when liquid.

2. It is denser when gaseous than when liquid.

3. It is lighter when frozen than when liquid.

a. Glucose, C6H12O6, is best described as a carbohydrate compound.

b. The statement that is NOT a property of water is "It is denser when frozen than when liquid." Option 1 is the correct answer.

Carbohydrates are organic compounds composed of carbon, hydrogen, and oxygen atoms in a ratio of approximately 1:2:1.

In fact, water is less dense when frozen than liquid, which is why ice floats on liquid water.

This is due to the unique property of water in which its molecules form a crystal lattice structure when frozen, which causes them to be more spread out and less dense than in the liquid state.

This property is important in aquatic ecosystems as it allows ice to float on top of bodies of water, preventing them from freezing solid and allowing life to continue below the surface.

Learn more about glucose at

brainly.com/question/30548064

#SPJ4

Other Questions
the type of nephron responsible for renal concentration is the:A. CorticalB. Juxtaglomerular Cual es el ambiente en el que se desarrolla en la obra 2 pesos de agua an analyst is working with a dataset of financial data. the numerical data is correct but it is formatted as u.s. dollars, and the analyst needs it to be in british pounds. what spreadsheet tool can help them select the right format? in follow-ups of asch's studies of conformity, participants who made their responses anonymously group of answer choices conformed significantly more than those who made their responses publicly. it is the responsibility of infosec professionals to understand state laws and standards. ____________ (True or False) essay about how to manage household tasks (epp) Divide and give your answer as a decimal. Round your answer to the nearest thousandth (3 digits behind the decimal).2/9 Which condition is correct for a firm wanting to maximize profit: A.MPL = MRP B.MPK > MRPK C.MRP = MC D.MPL = MC Identify the first term and common difference, then writea recursive rule for each of the sequences below:a) 1, -4,-9, -14, ....b) 11, 23, 35, 47, .... high-quality documentation reportoedly leads to a percent reduction in the system maintenance effort when compared A. 50 B. 80 C. 70 D. 60 anxiolytics have which effect? question 30 options: a) reduce hallucinations b) produce relaxation c) eliminate delusions d) elevate mood Is the gnashes of northern winds are the best norwegian winds to him a simile or a metaphor The table below shows carbon dioxide emissions and world population data for several years between 1800 and 2004.Year World Population(billions) Carbon Dioxide Emissions(metric tons carbon per year)1800 1 1001850 1.3 1751900 1.7 5001950 2.5 18002004 6 8000Based on the table above, how has population growth in the recent past most likely impacted the composition of the Earth's atmosphere? according to this figure, at what time in the evolutionary history of plants did vascular systems likely first evolve? 2. calculate the ph of a solution prepared by mixing 25.0 ml of 0.60 m hc2h3o2 and 15.0 ml of 0.60 m naoh? if one-third of this energy goes into heat and other forms of internal energy of the motor, with the rest going to the motor output, how much torque will this engine develop if you run it at 2400 rpm ? If 2 inches represents 75 miles on a map, then how many inches will represent 11 miles? Which of the following describes the feeding relationships from one organism to the next in a linear path? Food chain Trophic level Food web Consumer chart according to alfie kohn, competition promotes individual and group achievement better than cooperation. (true or false) Uso lo aprendido y describo a esta persona.