The specific heat of a 95.01 g piece of an unknown metal that exhibits a 45.2°C temperature change upon absorbing 1870 J of heat is 0.44J/g°C.
How to calculate specific heat?The specific heat capacity of a metal can be calculated using the following:
Q = mc∆T
Where;
Q = quantity of heat absorbed or released (J)m = mass of substance (g)c = specific heat capacity∆T = change in temperature (°C)According to this question, a 95.01 g piece of an unknown metal exhibits a 45.2°C temperature change upon absorbing 1870 J of heat. The specific heat capacity can be calculated as follows:
1870 = 95.01 × c × 45.2
1870 = 4294.452c
c = 0.44J/g°C
Therefore, 0.44J/g°C is the specific heat capacity of the metal.
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In the SI system of units [International System of Units], the mole is one of seven base units. It is frequently used in chemical calculations. However, a mole of something is just a particular quantity of it. It is not a unit of measure in the way that meters, seconds, and kilograms are. Calculations performed with the number of moles of a substance could also be performed with the number of particles of a substance. Based on this information, do you think that the mole should be considered a base unit in the SI system? Explain why or why not.
The mole is an SI unit that links the microscopic and macroscopic world that is why yes, mole is the base of SI unit.
What is a mole?
A mole is a popular scientific measurement unit for large quantities of very small items like atoms, molecules, or other specified particles in chemistry. It can also be spelt mol.
A extremely big amount, 6.02214076 1023 units, are designated by the mole. As of May 20, 2019, the General Conference on Weights and Measures defined the mole as this quantity for the International System of Units (SI). The mole was traditionally defined as the number of atoms found by experimentation to be present in 12 grammes of carbon-12.
The quantity of units in a mole is also referred to as Avogadro's number or Avogadro's constant in honour of the Italian physicist Amedeo Avogadro. Equal volumes of gases under the same conditions, according to Avogadro.
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A 2.00 gram sample of a glazed donut was placed in a bomb calorimeter with a heat capacity of 3.54 kcal/°C. The sample was completely burned, causing the temperature of the calorimeter to rise by 2.02 °C. How many kilocalories of energy were stored in the donut sample?
A 2.00 gram sample of a glazed donut was placed in a bomb calorimeter with a heat capacity of 3.54 kcal/°C. The sample was completely burned, causing the temperature of the calorimeter to rise by 2.02 °C. kilocalories of energy were stored in the sample is 14.30 kcal.
given that :
mass = 2 g
heat capacity = 3.54 kcal / °C
change in temperature = 2.02 °C
The heat energy expression is given as :
Q = mc ΔT
Q = 2 g × 3.54 kcal / °C × 2.02 °C
Q = 14.30 kcal
Thus, A 2.00 gram sample of a glazed donut was placed in a bomb calorimeter with a heat capacity of 3.54 kcal/°C. The sample was completely burned, causing the temperature of the calorimeter to rise by 2.02 °C. kilocalories of energy were stored in the sample is 14.30 kcal.
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A 98.3 g piece of copper (specific heat 0.380 J/g･°C) is heated and then placed into 400.0 g of water initially at 20.7°C. The water increases in temperature to 22.2°C. What is the initial temperature (in °C) of the copper? (The specific heat of water is 4.184 J/g･°C)
The initial temperature of copper is 89.41°C.
How to calculate temperature?Calorimetry is the science of measuring the heat absorbed or evolved during the course of a chemical reaction or change of state.
According to this question, a 98.3 g piece of copper with specific heat of 0.380 J/g･°C is heated and then placed into 400.0 g of water initially at 20.7°C. The water increases in temperature to 22.2°C. The initial temperature can be calculated as follows;
Q = mc∆T
Where;
Q = quantity of energym = mass of substancec = specific heat capacity∆T = change in temperatureQ(water) = -Q(metal)
400 × 4.184 × 1.5 = -(98.3 × 0.38 × {22.2 - x})
2510.4 = - (829.26 - 37.354x)
2510.4 = -829.26 + 37.354x
3339.659 = 37.354x
X = 89.41°C
Therefore, 89.41°C is the initial temperature of the copper metal.
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The initial temperature of the copper piece is approximately 0.72°C.
Explanation:
To find the initial temperature of the copper piece, we can use the equation Q = mcΔT, where Q is the heat energy, m is the mass of the substance, c is the specific heat capacity, and ΔT is the change in temperature.
First, let's calculate the heat energy gained by the water. The mass of the water is 400.0 g, and the change in temperature is 22.2°C - 20.7°C = 1.5°C.
Using the equation Q = mcΔT, we have:
Q_water = (400.0 g)(4.18 J/g • °C)(1.5°C) = 2490 J
Next, let's calculate the heat energy lost by the copper piece. The mass of the copper is 90.7 g, and the change in temperature is the same as the water, 1.5°C.
Using the equation Q = mcΔT, we have:
Q_copper = (90.7 g)(0.380 J/g • °C)(1.5°C) = 51.8 J
Since energy is conserved, the heat energy gained by the water is equal to the heat energy lost by the copper piece:
Q_water = Q_copper
2490 J = 51.8 J
Now, let's solve for the initial temperature of the copper piece. Rearranging the equation Q = mcΔT to solve for the initial temperature, we have:
T_initial = (Q_copper) / (m_copper * c_copper)
Substituting the values, we get:
T_initial = (51.8 J) / (90.7 g * 0.380 J/g • °C) ≈ 0.72°C
Therefore, the initial temperature of the copper piece is approximately 0.72°C.
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What is the mass in grams of 7.64 x 10^25
molecules of l₂?
Mass of 7.64 x 10^25 molecules of l₂ is 3.04 grams
Calculation of mass here we are doing from the number of molecules given. To do so we use the Avogadro's number. Avogadro's number is one of the most fundamental constants of chemistry. It helps us to compare the different atoms or molecules of given substances where the same number of atoms or molecules are being compared.
Along with that we will also be using the number mole as well here. number of moles is nothing but the given mass divided by the molecular mass of the compound.
To solve the above given question we use the below given formulas;
number of molecules = Number of moles × Avogadro number
Number of moles = Number of molecules
Avogadro number
⇒ 7.64×[tex]10^{25}[/tex] = 0.012 moles
6.023×[tex]10^{23}[/tex]
Mass = Number of moles × Molecular mass
⇒ 0.012 × 253.80 = 3.045 grams
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Mn2+
ions is prepared by dissolving 1.584 g of pure manganese metal in nitric acid and diluting to a final volume of 1.000 L. The following solutions are prepared by dilution. For solution A, 50.00 mL of stock solution is diluted to 1000.0 mL. For solution B, 10.00 mL of A is diluted to 250.0 mL. For solution C, 10.00 mL of B is diluted to 500.0 mL. Calculate the molar concentrations of the stock solution and solutions A, B, and C.
The molarity of the stock Mn²⁺ ions is 0.0288 M
Based on the dilution formula;
The molarity of A is 0.00144 MThe molarity of B is 0.0000576 MThe molarity of C is 0.000001152 MWhat is the molarity of a solution?The molarity of a solution is the number of moles of a solute dissolved in a given volume of solution in liters.
Molarity = number of moles/volumeThe molarity of the stock solution is:
moles of Mn²⁺ ions = mass / molar mass
molar mass of Mn²⁺ ions = 55.0 g/mol
moles of Mn²⁺ ions = 1.584 / 55
moles of Mn²⁺ ions = 0.0288 moles
molarity of Mn²⁺ ions = 0.0288 / 1
molarity of Mn²⁺ ions = 0.0288 M
The dilution formula is used to determine the molarities of A, B, and C.
C₁V₁ = C₂V₂
C₂ = C₁V₁ / V₂
Where;
C₁ = initial molarityV₁ = initial volumeC₂ = final molarityV₂ = final volumeMolarity of A = 50 * 0.0288 / 1000
Molarity of A = 0.00144 M
Molarity of B = 10 * 0.00144 / 250
Molarity of B = 0.0000576 M
Molarity of C = 10 * 0.0000576 / 500
Molarity of C = 0.000001152 M
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Help asap!!! What is rock cycle? How to label?
hope this helps you out I would have typed an answer using my notes but that was taking to long anyways have a nice day
When fossil fuels, such as gasoline, are burned, they create smoke. Smoke is best described as a heterogeneous mixture of solid particles from the burning fuel dispersed in a gas – usually air. Smoke can be described more specifically as a suspension.
What will most likely happen over time to smoke in the atmosphere?
A.The solid particles will spread out and dissolve.
b.The particles will eventually come together in a cloud and produce rain.
c.Over time, the solid particles will settle on whatever is outside.
d.The particles will remain mixed in the air.
The most likely will happen to smoke in the atmosphere is over time, the solid particles will settle on whatever is outside (Option C).
What is smoke?Smoke can be defined as any group or mixture of small particles that may be present in different states of matter in the air (i.e., in the solid state, liquid state and or gas state), generally composed of burning fossil fuels or carbon.
Therefore, with this data, we can see that smoke is generally composed of carbon but it is also represented by other types of particles in suspension in the atmosphere.
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One of the main components of an airbag is the gas that fills it. As part of the design process, you need to
determine the exact amount of nitrogen that should be produced. Calculate the number of moles of
nitrogen required to fill the airbag. Show your work. Assume that the nitrogen produced by the chemical
reaction is at a temperature of 495°C and that nitrogen gas behaves like an ideal gas. Use this fact sheet
u to review the ideal gas law.
The number of moles of the gas is 0.016 moles
The airbag reaction is the nitrogen gas obtained by the decomposition of sodium azide and the reaction is
2NaN₃ → 2Na + 3N₂
Then it is under ideal condition
P = 1atm
V = 1L
T = 495°C or 768 K
n = ?
We have to calculate moles of nitrogen = ?
R = 0.082 atm LK⁻¹mol⁻¹
So the formula is
PV =nRT
n = PV/RT
n = 1 atm×1L/0.082 atm LK⁻¹mol⁻¹×768 K
n = 0.016 moles
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I really need help!
I promise I've been paying attention, it just goes in one ear and out the other ;-;
(question is in picture!)
Answer: the balanced equation is the same.
Explanation:
Every element must have the same number of atoms on each side of the equation (law of conservation of mass).
2. Balancing the equation can be done only by adjusting the coefficients.
C
is a balanced element because there is the same number of atoms of
C
in each side of the equation.
C
is a balanced element
H
is a balanced element because there is the same number of atoms of
H
in each side of the equation.
H
is a balanced element
O
is a balanced element because there is the same number of atoms of
O
in each side of the equation. O is a balanced element. Na is a balanced element because there is the same number of atoms of Na on each side of the equation. Na is a balanced element H is a balanced element because there is the same number of atoms of H on each side of the equation. H is a balanced element C is a balanced element because there is the same number of atoms on each side of the equation. C is a balanced element. O
is a balanced element because there is the same number of atoms of
O in each side of the equation. O is a balanced element. All elements have the same number of atoms on each side of the equation, which means that the law of conservation of mass is satisfied and thus the chemical equation is balanced.
What mass of CaCl2 (in g ) should the chemist use?
The mass of the solute required is 250.25 g.
What is the mass of the solute?We know that the number of moles of the solute can be used to obtain the mass of the solute that is required. We can now try to find the mass of the solute that is required.
Concentration of the solution = 0.350M
Volume of the solution = 6.5 L
Number of moles of the solute = 0.350M * 6.5 L
= 2.275 moles
We now have the mass of the solute as;
2.275 moles * 110 g/mol
= 250.25 g
Th measured mass of the solute that we would have to use is 250.25 g.
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Missing parts;
A chemist wants to make 6.5 L of a .350M CaCl2 solution. What mass of CaCl2(in g) should the chemist use?
A quantity of nitrogen gas is enclosed in a tightly stoppered 500 mL flask at room temperature (20.0 °C) and 0.836 atm pressure. The flask is then heated to 680 °C. If the flask can withstand pressures up to 3 atm, will it explode under this heating?
The vessel will not explode since the new gas pressure is less than 3 atm.
What will be the pressure when the temperature of a given volume of nitrogen gas is heated?The pressure when the temperature of a given volume of nitrogen gas is heated is calculated using the formula given below:
P₁/T₁ = P₂/T₂where;
P₁ = initial pressureT₁ = initial temperatureP₂= final pressureT₂ = final temperatureSolving for P₂
P₂ = P₁ * T₂ / T₁
P₂ = 0.836 * (680 + 273) / (20 + 273)
P₂ = 2.72 atm
The new pressure is less than 3 atm.
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You react 4.16g of sodium hydroxide with 5.81g hydrochloric acid according to the following reaction you produce 5.79 g of sodium chloride. What is your percent yield?
The limiting reactant in the reaction is NaOH. one mole or 40 g of NaOH gives 58.5 g of NaCl. Thus, 4.16 g have to give 6.08 g but the actual yield is 5.79 g. Thus the percent yield of the reaction is 95%.
What is percent yield?Percent yield of a reaction is the ratio of actual yield to the theoretical yield multiplied by 100.
The molar mass of NaOH is 40 g/mol. Thus number of moles of NaOH is 4.16 /40 = 0.10 moles. Similarly the molar mass of HCl is 36.5 g/mol and number of moles in 5.81 g is 5.81/ 36.5 = 0.15 moles.
One mole of HCl needs 1 mole of NaOH, thus 0.15 moles need 0.15 moles NaOH but we have 0.1 only. Thus, NaOH is the limiting reactant.
40 g of NaOH gives 58.5 g of NaCl (1 mole). Thus the theoretical yield for 4.16 g of NaOH is :
= ( 4.16 × 58.5 )/40
= 6.04 g.
The actual yield is 5.79 g. Thus percent yield =(5.79/6.04) × 100 = 95%.
Hence, the percent yield of the reaction is 95%.
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Please help (see file attached!!)
A = 2.86 x [tex]10^{23[/tex] molecules of [tex]KMnO_4[/tex]
B = 323.76 grams of Al
C = 1.53 moles of Au
D = 7.71 x [tex]10^{23[/tex] molecules of [tex]H_3PO_4[/tex]
E = 4.52 x [tex]10^{23[/tex] total atoms
Avogadro's moleculesAccording to Avogadro, a single mole of any substance contains 6.022 x [tex]10^{23[/tex] molecules or atoms of the substance.
Also, the mole of a substance is the ratio of the mass of the substance and the molar mass of the substance. In other words;
mole = mass/molar mass
These theories are what we need to solve the outlined problems.
Molar mass of [tex]KMnO_4[/tex] = 158 g/molMole of 75 g of [tex]KMnO_4[/tex]:
mass/molar mass = 75/158
= 0.4747 mol
Since 1 mole = 6.022 x [tex]10^{23[/tex] molecules
0.4747 mole = 0.4747 x 6.022 x [tex]10^{23[/tex]
= 2.86 x [tex]10^{23[/tex] molecules
7.23 x [tex]10^{24[/tex] Al atomsSince 1 mole = 6.022 x [tex]10^{23[/tex] molecules or atoms
7.23 x [tex]10^{24[/tex] atoms = 7.23 x [tex]10^{24[/tex] / 6.022 x [tex]10^{23[/tex]
= 12 moles
Mass of 12 moles Al = 12 x 26.98
= 323.76 grams
9.23 x [tex]10^{23[/tex] Au atoms = 9.23 x [tex]10^{23[/tex]/6.022 x [tex]10^{23[/tex]= 1.53 moles
125 g of [tex]H_3PO_4[/tex] = 125/97.99= 1.28 moles
1.28 moles = 1.28 x 6.022 x [tex]10^{23[/tex]
= 7.71 x [tex]10^{23[/tex] molecules
0.75 moles of [tex]CO_2[/tex] = 0.75 x 6.022 x [tex]10^{23[/tex]= 4.52 x [tex]10^{23[/tex] atoms
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What is ethanoic or acetic anhydride?
Acetic anhydride is a colorless liquid with a characteristic pungent odor. It is used in the manufacture of plastics, drugs, dyes, perfumes, explosives, and aspirin.
This chemical compound has a colorless liquid appearance, also called anhydride, acetic, smells like vinegar.
what did early chemist focus on answering 
Early "chemists" focused on practical problems - the production of dyes and perfumes, the production of soap, the use of metals, the production of glass, etc. The goal was not to make sense of the physical world.
Who were early chemists and what motivated them?Tapputi (also known as Tapputi-Belatekallim, referring to the female attendants of the palace), believed to be the world's first recorded chemist and perfume maker, mentioned in a cuneiform tablet from Babylonian Mesopotamia, circa 1200 BC It is BC is mentioned.
Along with Lavoisier, Boyle, and Dalton, Berzelius is considered the father of modern chemistry. In 1828, using oxygen as a standard and fixing its weight at 100, he produced a table of relative atomic weights containing all the elements known at the time.
Very early chemists were often motivated primarily by achieving a particular goal or product. It didn't take a lot of theory to make perfume or soap, just a good recipe, and attention to detail. There was no standard way to name substances (and no periodic table we could all agree on).
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The sun, moon, and planets of the solar system are shown with their orbits.
The loops in Ptolemy’s model, and those shown on the video, are called motion.
This phenomenon is caused by Earth’s orbit than those of other planets.
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Answer: 1 one is B 2 one is C 3 one is A
The sun, moon, and planets of the solar system are shown with their orbits.
The loops in Ptolemy’s
1 one
A retrograde
B geocentric
C retrograde
model, and those shown on the video, are called
2 one
A heliocentric
B geocentric
C retrograde
motion.
This phenomenon is caused by Earth’s
3 one
A faster
B slower
C larger
orbit than those of other planets.
An AM radio station broadcasts at 1030 kHz , and its FM partner broadcasts at 98.4 MHz
The energy from the photons in the FM station is greater than that from the AM station.
What is the energy of the both photons?We have to recall that the radio waves are also a part of the electromagnetic spectrum and that the speed that is possessed by all of the waves waves that are in the electromagnetic spectrum is the speed of light (3 * 10^8 m/s).
We have;
E = hf
E = energy
h = Plank's constant
f = frequency
For the AM station;
E = 6.6 * 10^-34 Js * 1030 * 10^3 Hz
E = 6.798 * 10^-28 J
For the FM station;
E = 6.6 * 10^-34 Js * 98.4 * 10^6 Hz
= 6.494 * 10^-25 J
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Missing parts;
An AM radio station broadcasts at 1030 kHz , and its FM partner broadcasts at 98.5 MHz .
partA;Calculate the energy of the photons emitted by the AM radio station.
partB;Calculate the energy of the photons emitted by the FM radio station.
partC;Compare the energy of the photons emitted by the AM radio station with the energy of the photons emitted by the FM radio station.
At a crime scene, Lorenzo finds a gun in shallow pond water. How should he transport the gun to BEST preserve the evidence?
A.
He should drain the water and then put the gun in a plastic bag.
B.
He should rinse the gun, dry it, and then put it in a paper bag.
C.
He should clean the gun and collect a separate water sample.
D.
He should keep the gun submerged in water as he transports it.
Answer:d
Explanation:
what are Faraday's laws of induction??? Grade 9.
Answer:
Hope It Helps You
Explanation:
Please Mark Me As BrainliestWhich of the following best describes temperature:
A: number of molecules
B:motion of molecules
C:size of molecules
D:type of molecules
A chemist needs 16.61 mL of 1.312 M NaOH. What volume in mL of 3.6 M NaOH must be diluted in water to form this solution?
Please report your answer in mL to 3 decimal places.
A chemist must take 6.053 mL of 3.6 M NaOH in water to form 16.61 mL of 1.312 M NaOH solution.
In the laboratory, high-concentration solutions are prepared for using a longer duration. This solution is known as a stock solution. These solutions are diluted based on chemical needs. We need 6.61 mL of 1.312 M NaOH solution The stock concentration of NaOH solution = 3.6 M We have to find the volume of this stock solution that should be taken Given M₁ = 3.6 M M₂ = 1.312 M V₂ = 16.61 mL V₁ =?
M₁V₁ =M₂V₂
3.6 × V₁ = 1.312 × 16.61
V₁ = 1.312 × 16.61 ÷ 3.6
V₁ = 6.053 mL
Hence, 6.053 mL of 3.6 M NaOH is needed to form 16.61 mL of 1.312 M NaOH solution
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If a gas that has a pressure of 15 atm, a volume of 28 liters, and a
temperature of 400 K, has an increased pressure to 18 atm and increase
the temperature to 500 K, what is the new volume of the gas?
о 8,571 L
о 29.17 L
525 L
18.9 L
*
2 points
To calculate the new volume of a gas, we must first understand the atm.
What is atm?
oceanic atmospheric pressure At sea level, it has a mean value of about and is defined as the pressure created by the weight of the atmosphere. Sometimes, this figure is used as a standard pressure or a reference pressure. The unit of pressure is atm.
What does one atmosphere of pressure equal?
760 cm of mercury is equal to one atmosphere of pressure at sea level.
Using the atm formula,
P1 V1/T1 = P2 V2/T2
15×28/500= 18×V2/500
15×28×400/500×18 = V2
V2=29.166
V2=29.17 L
Therefore the option (B) is correct.
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724.4g of ammonium phosphate in 4500 mL of alcohol. what is the molarity?
The molarity of the 724.4g of ammonium phosphate in 4500 mL of alcohol is 1.0804m.
Ammonium phosphate [tex]$\Rightarrow\left(\mathrm{NH}_4\right)_3 \mathrm{PO}_4$[/tex]
GMM of Ammonium Phosphate [tex]$\Rightarrow 109 \mathrm{~g}+40 \mathrm{~g}$[/tex] [tex]$\Rightarrow 149 \mathrm{~g}$[/tex]
No. of moles of Ammonium Phosphate [tex]$\Rightarrow\left\{\frac{724.4}{149}\right\} \Rightarrow 4.8$[/tex]
Molarity = 4.86/4.5 = 1.0804m.
Phosphates are low in toxicity, however they create nutrient contamination and nourish algae. Eutrophication and hazardous algal blooms result as a result of this. Many countries, notably the European Union and the United States, have outlawed the use of phosphates in detergent.
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1 gram of hydrogen ALWAYS reacts with 8 grams of oxygen. Precious mixes 2g of hydrogen with 20g of oxygen. (i) How much water is formed? [2
Answer:
18g
Explanation:
1g H + 8g O = 9g H2O since H is limiting factor
Calculate the mass percent of the following solution: 65g of KCl in 46.6g of water
Considering the definition of mass percent, the mass percent of a solution of 65g of KCl in 46.6g of water is 58.24%.
Mass percentThe mass percent is a measure of the amount of mass that an element occupies in a compound and indicates the percentage by mass of each element that is part of a compound.
The mass percent is calculated as the mass of the solute divided by the mass of the solution, the result of which is multiplied by 100 to give a percentage. This is:
mass percent= (mass of solute÷ mass of solution)× 100%
Mass percent in this caseIn this case, you know:
mass of solute (KCl)= 65 gmass of water= 46.6 gmass of solution= mass of solute + mass of water= 65 gr + 46.6 g= 111.6 gReplacing in the definition of mass percent:
mass percent= (65 g÷ 111.6 g)× 100%
Solving:
mass percent= 58.24%
Finally, the mass percent is 58.24%.
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The greatest distance across the moon's orbit is 772,000 km; the eccentricity of its orbit is 0.055. How far
apart are the foci of the moon's orbit?
14036363. 64 kmThe distance apart are the foci of the moon's orbit.
The Moon is Earth's handiest natural satellite tv for pc. it's miles the fifth largest satellite within the solar gadget and the biggest and big relative to its parent planet, with a diameter about one zone that of Earth.
The foci of the moon's orbit = 772,000 km/ 0.055
= 14036363. 64 km.
The Moon takes approximately one month to orbit Earth (27. three days to finish a revolution, but 29.5 days to alternate from New Moon to New Moon). because the Moon completes each 27. three-day orbit around Earth, each Earth, and the Moon are transferring across the solar.
The Moon orbits Earth inside the same course as our planet rotates. So, the Moon clearly acts from west to east through our sky, albeit so slowly that we almost by no means note it.
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If we use 25.05 mL of the solution above to reach the endpoint titrating 10.00 mL of a 0.200 M HCl solution, what is the working (actual) concentration of the NaOH solution? Remember, you need a balanced chemical reaction for stoichiometry. (do not forget about SF)
The concentration of the solution is obtained as 0.08 M.
What is the concentration of sodium hydroxide?We know that the reaction that occurs between the sodium hydroxide and the hydrochloric acid is one that may be referred to as neutralization reaction. We can see that the reaction is given by; [tex]NaOH(aq) + HCl(aq) --- > NaCl(aq) +H_{2} O(l)[/tex]
Thus;
Concentration of the acid CA = 0.200 M
Volume of the acid VA = 10.00 mL
Volume of the base VB = 25.05 mL
Concentration of the base CB = ??
Number of moles of the acid NA = 1
Number of moles of the base NB = 1
Then;
CAVA/CBVB = NA/NB
CAVANB = CBVBNA
CB= CAVANB/VBNA
CB = 0.200 M * 10.00 mL * 1/ 25.05 mL * 1
= 0.08 M
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0.620 L of a 2.6 MKCl solution Express your answer using two significant figures.
The number of moles in 0.620 L of a 2.6M KCl solution is 1.61 moles.
How to calculate number of moles?Molarity is the concentration of a substance in solution, expressed as the number of moles of solute per litre of solution.
The molarity of a solution can be calculated by dividing the number of moles of the substance by its volume as follows:
no of moles = molarity × volume
According to this question, 0.620 L of a KCl solution has a molarity of 2.6 M. The number of moles of the substance is as follows:
no of moles = 2.6M × 0.620L = 1.612moles
Therefore, 1.61 moles is the number of moles in the pottasium chloride solution.
The incomplete question is as follows:
Determine the number of moles contained in 0.620L of a 2.6 M KCl solution.
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How many protons and electrons are present in one Br -ion2
Answer:
Br- has 35 protons and 36 electrons
Explanation:
Do you mean Br-?
Br has atomic number of 35 => 35 protons.
Neutral Br has 35 electrons.
Br- has 1 extra electron, resulting in total of 36 electrons.
Choose all the molecules in which the central atom has an expanded octet.
BrF3
BF3
SF2
SF6
The molecules in which the central atom has an expanded octet is BrF₃ ans SF₆.
Hypervalent compound is the compound in which central atom contains more than 8 electrons or expanded octet. Hypovalent is the compound in which atom posses less than eighth electron in the valence shell. in In BrF₃ , Bromine has 7 valence electron and fluorine seven electrons . the three F atom complete their octet after the bonding with Br but In Br there are 10 electrons in valence shell . so, BrF₃ has expanded octet. SF₆, the sulfur , sulfur has 6 valence electron and Fluorine has 7 valence electron F atom complete there octet with sulphur but S atom has 12 valence electrons that is expanded octet.
Thus, The molecules in which the central atom has an expanded octet is BrF₃ ans SF₆.
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