Part B
Calculate the following quantities, and record them in the table:

the number of moles of citric acid used (Use 192.13 grams/mole as the molar mass of citric acid.)
the heat absorbed by the water, in joules (Use Q = mCΔT, where 15.0 milliliters of water has a mass of 15.0 grams. Use 4.186 joules/gram degree Celsius as water’s specific heat capacity.)
the change in internal energy of the mixture of citric acid and sodium bicarbonate. (Assume that energy absorbed by the mixture of citric acid and sodium bicarbonate is released by the water.)
the reaction enthalpy, in joules/mole

The equilibrium constant (K) for the given reaction at 250°C is 0.200.

What is Equilibrium?

Equilibrium refers to a state of balance or stability in a system where opposing forces or processes are in balance, resulting in no net change over time. In the context of chemical reactions, equilibrium refers to a point at which the rates of the forward and reverse reactions are equal, resulting in a constant concentration of reactants and products over time.

To calculate the equilibrium constant (K) for the given reaction at the given temperature, we can use the concentrations of reactants and products at equilibrium.

Given:

Initial concentration of P[tex]Cl_{5}[/tex] ([P[tex]Cl_{5}[/tex]]0) = 0.300 M

Final concentration of P[tex]Cl_{5}[/tex] ([P[tex]Cl_{5}[/tex]]eq) = 0.200 M

The change in concentration of PCl5 ([PCl5]change) can be calculated as the difference between the initial and final concentrations:

[PCl5]change = [P[tex]Cl_{5}[/tex]]0 - [P[tex]Cl_{5}[/tex]]eq

Substituting the given values into the equation:

[P[tex]Cl_{5}[/tex]]change = 0.300 M - 0.200 M

[P[tex]Cl_{5}[/tex]]change = 0.100 M

According to the balanced chemical equation, the change in concentration of P[tex]Cl_{3}[/tex] and [tex]Cl_{2}[/tex]will also be 0.100 M, as the stoichiometric coefficient of P[tex]Cl_{5}[/tex] in the balanced equation is 1.

Now, we can use the concentrations of reactants and products at equilibrium to calculate the equilibrium constant (K) using the following expression for the given reaction:

K = ([P[tex]Cl_{3}[/tex]]eq * [[tex]Cl_{2}[/tex]]eq) / ([P[tex]Cl_{5}[/tex]eq)

Since the change in concentration of P[tex]Cl_{5}[/tex] is equal to the change in concentration of P[tex]Cl_{3}[/tex] and [tex]Cl_{2}[/tex], we can substitute [P[tex]Cl_{5}[/tex]]change for [P[tex]Cl_{3}[/tex]]eq and [[tex]Cl_{2}[/tex]]eq in the equation:

K = ([P[tex]Cl_{5}[/tex]]change * [P[tex]Cl_{5}[/tex]]change) / [P[tex]Cl_{5}[/tex]]eq

K = (0.200)(0.200) / 0.200

K = 0.200

Using a calculator, we can calculate the value of K:

K = 0.25

Learn more about Equilibrium from the given link

brainly.com/question/18849238

#SPJ1

The correct statement is: the most probable molecular speed decreases as the molar mass of the gas increases. The relationship observed between the most probable molecular speed and the molar mass of the gas is that the most probable molecular speed decreases as the molar mass of the gas increases. This is because heavier molecules have more inertia and therefore move more slowly than lighter molecules. So, the larger the molar mass, the slower the molecular speed.

This relationship can be explained by the equation for the most probable molecular speed (V_p), which is derived from the Maxwell-Boltzmann distribution:

V_p = √(2 * R * T / M)

where:
- V_p is the most probable molecular speed
- R is the ideal gas constant
- T is the temperature in Kelvin
- M is the molar mass of the gas

As you can see from the equation, the most probable molecular speed (V_p) is inversely proportional to the square root of the molar mass (M). This means that when the molar mass increases, the most probable molecular speed decreases, and vice versa.

Learn more about molar mass at https://brainly.com/question/837939

#SPJ11

The relationship observed between the most probable molecular speed and the molar mass of the gas is the most probable molecular speed decreases as the molar mass of the gas increases.

This relationship can be explained by the following steps:
1. Molecular speed refers to the velocity of individual molecules in a gas sample.
2. Molar mass is the mass of one mole of a substance, usually expressed in grams per mole (g/mol).
3. The most probable molecular speed can be estimated using the Maxwell-Boltzmann distribution, which describes the distribution of molecular speeds in a gas.
4. According to this distribution, lighter molecules (with lower molar mass) tend to have higher molecular speeds than heavier molecules (with higher molar mass) at the same temperature.
5. Therefore, as the molar mass of a gas increases, the most probable molecular speed decreases.

To learn more about molecular speed, refer:-

https://brainly.com/question/19243977

#SPJ11

The percent by mass of salt in the mixture is 59.15%.

To find the percent by mass of salt in the mixture, you need to calculate the total mass of the mixture first.

Total mass of mixture = mass of sand + mass of salt

We know that the total mass of the mixture is 2.35 g and that 1.39 g of salt was recovered. So,

Total mass of mixture = 2.35 g

Mass of salt = 1.39 g

Mass of sand = Total mass of mixture - Mass of salt

Mass of sand = 2.35 g - 1.39 g

Mass of sand = 0.96 g

Now that we know the mass of both salt and sand, we can find the percent by mass of salt in the mixture:

% by mass of salt = (mass of salt / total mass of mixture) x 100

% by mass of salt = (1.39 g / 2.35 g) x 100

% by mass of salt = 59.15%

Therefore, the percent by mass of salt in the mixture is 59.15%.

Know more about   mass  here:

https://brainly.com/question/86444

#SPJ11

We can conclude that the value of A must be less than the value of B. Based on the graph, the value of B is around 0°C. So, we can estimate that the value of A is likely to be around -10°C to 0°C.

What is Temperature?

Temperature is a physical quantity that measures the degree of hotness or coldness of an object or substance. It is a measure of the average kinetic energy of the particles that make up a system.

In simpler terms, temperature is a measure of how fast the atoms and molecules in a substance are moving. When the particles are moving faster, the temperature is higher, and when they are moving slower, the temperature is lower.

Based on the given information, we know that at time 0 minutes, the temperature is labeled as A. Therefore, to find the temperature value of A, we need to look at the y-axis at time 0 minutes.

Since the temperature scale is not given, we cannot determine the numerical value of A directly. However, we can make some observations about the graph to infer the approximate value of A.

Learn more about Temperature from the given link

https://brainly.com/question/26866637

#SPJ1

You are an igneous rock, more precisely a volcanic glass or obsidian created by the swift cooling of lava, which lacks any discernible crystals.

Metamorphic rocks are produced when rocks are subjected to high pressures, high temperatures, hot mineral-rich fluids, or, more usually, any combination of these circumstances.. These kinds of conditions can be found either deep within the planet or at tectonic plate collisions.

Igneous rocks are types of rocks that are formed when molten rock, or rock that has been liquefied by extremely high heat and pressure, cools to a solid condition, according to definitions. When molten rock cools, it solidifies into rocks like basalt, rhyolite, or obsidian. Lava is molten rock that flows out of cracks or vents at volcanic centres.

To know more about obsidian visit:-

https://brainly.com/question/14971262

#SPJ1

Answer:

Answer (Detailed Solution Below)

Explanation:

Option 3 : Substance in solid phase has the least entropy.

The sample of pure carbon would contain approximately 2.135 x 10²⁴ carbon atoms.

The majority of carbon atoms—98.93%—have masses of 12 atomic mass units. A mass of 13.00 atomic mass units is present in 1.07% of the carbon atoms. 14.) Identify one distinction between the nuclei of carbon-12 and carbon-13 atoms in terms of the subatomic particles that can be discovered there.

First, using the atomic mass of carbon, we must determine how many moles of carbon are present in the sample:

1 mole of carbon atoms = 12.01 g of carbon atoms (atomic mass of carbon)

42.552 g of carbon atoms / 12.01 g/mol = 3.545 moles of carbon atoms

Using Avogadro's number, we can then determine how many carbon atoms are present in the sample:

Number of carbon atoms = 3.545 moles of carbon atoms x 6.022 x 10²³ atoms/mole

Number of carbon atoms = 2.135 x 10²⁴ atoms

To know more about carbon atoms visit:-

https://brainly.com/question/30507533

#SPJ1

The gaseous neon atoms in a neon sign emit light when neon atoms gain enough energy to become excited.

At the tube's ends, there is an electrode. Although a neon lamp may operate with either AC (alternating current) or DC (direct current), the glow is only visible around one electrode when DC current is utilised. The majority of neon lights you see operate on AC electricity.

The neon atoms receive enough energy when a 15,000 volt electric voltage is introduced to the terminals to remove one of their outer electrons. Nothing will happen if there is insufficient voltage since there won't be enough kinetic energy for the electrons to break free of their atoms. While unbound electrons are drawn to the positive terminal, positively charged neon atoms (cations) are drawn to the negative terminal. Plasma is the name for these charged particles.

Learn more about Neon atoms:

https://brainly.com/question/1991712

#SPJ4

When an electrical current is applied to the neon gas in the sign, it ionizes the atoms, meaning it strips them of one or more of their electrons.

These newly charged particles then collide with other neon atoms in the tube, transferring some of their energy in the process.  As the neon atoms relax back to their ground state, they release this excess energy in the form of light. Specifically, neon emits light in the red-orange range of the visible spectrum, which is why neon signs often have a distinct warm glow.
In summary, the process of ionization and subsequent relaxation of excited neon atoms is what causes a neon sign to emit light.
When a neon sign emits light, the process involves gaseous neon atoms, electron excitation, and the release of photons. An electric current passes through the neon gas, causing the electrons in neon atoms to gain energy and move to a higher energy level (electron excitation).

As these excited electrons return to their original energy level, they release energy in the form of photons, which we perceive as the characteristic glow of a neon sign.

To learn more about ionization click here

brainly.com/question/28385102

#SPJ11

I don't think you can actually do anything since kool aid contains substances that can be easily degradated and usually methods that involves concentration (which is this case since you basically diluted the kool aid with water) are usually quite destructive, especially for sensible substances. I might be wrong, but I don't think you can do anything about this

The velocity of the 10 M¤ star will be 1/2 times the velocity of the 5 M¤ star of binary star system.

In a binary star system, the velocity of each star depends on their masses and distances from each other. According to Kepler's laws, the more massive star will have a smaller orbit radius and a faster orbital velocity. Therefore, in this binary star system with stars of 10 m¤ and 5 m¤, the velocity of the 10 m¤ star will be higher than that of the 5 m¤ star. The exact ratio of their velocities cannot be determined without additional information about their distances and orbits.
In a binary star system, the stars orbit around a common center of mass. According to Kepler's laws of planetary motion, the velocities of the two stars are inversely proportional to their masses.

Let v1 be the velocity of the 10 M¤ star and v2 be the velocity of the 5 M¤ star. Using the inverse proportionality of velocities and masses, we can write the following equation:

v1 / v2 = M2 / M1

where M1 is the mass of the 10 M¤ star and M2 is the mass of the 5 M¤ star. Now, we can plug in the given values:

v1 / v2 = (5 M¤) / (10 M¤)

Simplify the equation:

v1 / v2 = 1 / 2

So, the velocity of the 10 M¤ star will be 1/2 times the velocity of the 5 M¤ star.

Learn more about binary star system here:

https://brainly.com/question/29912300

#SPJ11

The velocity of the 10 m¤ star will be approximately 0.71 times the velocity of the 5 m¤ star in this binary star system.

v = √(GM/r)

[tex]v_10m / v_5m[/tex]= √(G(5m¤) / r) / √(G(10m¤) / r)

Simplifying the equation, we get:

[tex]v_10m / v_5m[/tex] = √(5/10) = √0.5 ≈ 0.71

The star system is a way to represent the electronic configuration of an atom. It is also known as the "Hund's rule star notation" or "star diagram." The star system is used to show the distribution of electrons in different orbitals of an atom. In this notation, each orbital is represented by a circle, and each circle is divided into sections (or lobes) representing the different possible values of the angular momentum quantum number (l).

The sections are labeled using the corresponding values of l, such as s, p, d, f, and so on. Electrons are represented by arrows, with the direction of the arrow indicating the spin of the electron. The arrows are placed in the sections of the orbital circles according to Hund's rule, which states that electrons will fill the orbitals with the same energy level singly and with the same spin before pairing up.

To learn more about Star system visit here:

brainly.com/question/17046229

#SPJ4

The given statement "A fractional distillation that involves the use of the fractionating column and to provide the multiple condensation or the evaporation cycles over the given distance" is true as it involves the separation of the miscible liquids.

The Fractional distillation is the type of the distillation that will involves the separation of the miscible liquids. This process will involves the repeated distillations and the condensations. The mixture is separated into the component parts. The separation that happens when the mixture will be heated at the certain temperature and the fractions of the mixture will start to vaporize.

The more will be the volatile components will  increase in the vapor state after the heating, and when it  is liquefied, the  volatile components increase in the liquid state.

To learn more about Fractional distillation here

https://brainly.com/question/27004370

#SPJ4

The color of the light absorbed by the copper (II) sulfate solution cannot be determined solely based on the wavelength absorbed by the cobalt (II) chloride solution.

The example absorption spectra for cobalt(II) chloride in water is seen below. On the y-axis, a number termed absorbance (which has no units) is shown, and on the x-axis, wavelength (in nanometers). The wavelength at which the absorbance is greatest is 510 nm. This equates to a blue-green colour.

Red light in the spectrum is absorbed by copper(II) ions in solution. All the colours, with the exception of red, will be present in the light that exits the solution. This combination of wavelengths appears to us as a soft blue (cyan).

To know more about chloride solution visit:-

https://brainly.com/question/28792273

#SPJ1

The volume of the sample of wood is 110.9 mL.

Volume is the measure of the amount of space which is occupied by an object or the substance. It is usually expressed in units such as liters, milliliters, cubic meters, or cubic centimeters. The volume of a solid can be calculated by measuring its dimensions and using mathematical formulas, while the volume of a liquid can be measured directly using a graduated cylinder or a pipette.

To find the volume of the sample of wood, we can apply the following formula;

Density = Mass/Volume

Rearranging the formula, we get;

Volume = Mass/Density

Substituting the given values, we get:

Volume = 95.1 g / 0.857 g/mL

Volume = 110.9 mL

To know more about volume here

https://brainly.com/question/1578538

#SPJ4

Answer:

mass of NH₃ formed when 22g of H₂ react completely = 124.67 grams

Explanation:

3H₂ + N₂ → 2NH₃

The ratio of coefficients of reactants and products in the above reaction equation (3 : 1 : 2), is known as the stoichiometry of the reaction.

A stoichiometric amount of a reagent is the the optimum amount or ratio where, assuming that the reaction proceeds to completion, all of the reagent is consumed, there is no deficiency of the reagent, and there is no excess of the reagent. Thus if the stoichiometry of a reaction is known, as well as the mass of one of the substances, then it is possible to calculate the mass of any of the other substances.

The mole is a unit of amount of substance established by the International System of Units, to make expressing amounts of reactant or product in a reaction more convenient. As defined by Avogadro's Constant, a mole is 6.022×10²³ amounts of something. The mole is used in stoichiometric calculations, instead of the mass.

To convert from mass to moles, we need to divide the mass present in grams, by the molar mass of the substance (the sum of the molar masses of the individual elements comprising the compound), in g/mol, to get the moles. This can be represented by the formula: n = m/M, where n = number of moles, m = mass, M = molar mass.

So if we have 22 g of H₂ gas, which reacts completely, and therefore is a stoichiometric amount, then converting this to moles:

n(H₂) = m/M = 22/2 = 11 mol.

Using our stoichiometry, we can see that the ratio of H₂ to NH₃ = 3 : 2.

Therefore, for every 3 moles of H₂ used, we produce 2 moles of NH₃.

n(NH₃) = 2/3 × n(H₂) = 2/3 × 11 = 7.333 mol.

Finally, converting moles back to mass we get:

m(NH₃) = n×M = 7.333×17 = 124.67 grams

∴ mass of NH₃ formed when 22g of H₂ react completely = 124.67 grams

Answer: broken down into smaller molecules

Explanation: The proteins, lipids, and polysaccharides that make up most of the food we eat must be broken down into smaller molecules before our cells can use them—either as a source of energy or as building blocks for other molecules.

For most substances, the relative densities of the phases are as follows: solid phase > liquid phase > gas phase.

To understand the relative densities of the phases for most substances.
In general, the density of a substance varies depending on its phase (solid, liquid, or gas). Here's a brief description of the relative densities for each phase:
1. Solid phase: In most substances, the solid phase has the highest density. This is because the particles (atoms, molecules, or ions) are tightly packed together in a fixed, organized arrangement, resulting in minimal space between them.
2. Liquid phase: The liquid phase usually has a lower density compared to the solid phase. In this phase, the particles are still close together, but they have more freedom to move around. This increased movement results in a slightly less compact arrangement, thus leading to a lower density.
3. Gas phase: The gas phase has the lowest density among the three phases. In this phase, the particles are widely spaced apart and move freely in all directions. A large amount of empty space between particles contributes to the significantly lower density of the gas phase.

To leran more about relative densities, refer:-

https://brainly.com/question/15164682

#SPJ11

The relative densities of the phases are as follows: solid phase > liquid phase > gas phase.

The relative densities of the phases of most substances vary depending on the specific substance and the conditions it is in. Generally, the solid phase has the highest density, followed by the liquid phase, and then the gas phase. This is because in the solid phase, the molecules are tightly packed together and have little room to move, resulting in a higher density. In the liquid phase, the molecules are still close together but have more room to move around, resulting in a slightly lower density than in the solid phase but a higher density than in the gas phase. In the gas phase, the molecules are more spread out and have the most room to move, resulting in the lowest density of the three phases.

However, it's important to note that some substances may have exceptions to these general trends, depending on their specific molecular structures and the conditions they are in.

To know more about relative density:

https://brainly.com/question/20337365

#SPJ11

The pH of the solution after 3.2 mL of NaOH have been added to the HNO3 is 12.33.

To solve this problem, we need to use the equation:

M(acid)V(acid) = M(base)V(base)

Where M is the molarity of the solution and V is the volume in milliliters.

First, we need to calculate the moles of HNO3 in the initial solution:

0.25 M x 20.0 mL = 0.005 moles HNO3

Next, we need to determine how many moles of NaOH were added to the solution:

0.15 M x 3.2 mL = 0.00048 moles NaOH

Since NaOH is a strong base, it will completely react with the HNO3, forming water and a salt. This means that the number of moles of HNO3 is reduced by the number of moles of NaOH:

0.005 moles HNO3 - 0.00048 moles NaOH = 0.00452 moles HNO3 remaining

Now, we can use the equation for the dissociation of HNO3 in water:

HNO3 + H2O → H3O+ + NO3-

The concentration of H3O+ can be found using the equation for the ion product of water:

Kw = [H3O+][OH-]

Kw is a constant equal to 1.0 x 10^-14 at 25°C. At this point, we have added enough NaOH to completely react with the HNO3, which means that all of the H3O+ initially present in the solution has been neutralized.

Therefore, [OH-] = (moles of NaOH added) / (total volume of solution)

[OH-] = 0.00048 moles / (20.0 mL + 3.2 mL) = 0.0214 M

Using Kw, we can calculate [H3O+]:

1.0 x 10^-14 = [H3O+][OH-]

[H3O+] = 4.67 x 10^-13 M

Finally, we can convert this concentration to pH:

pH = -log[H3O+] = -log(4.67 x 10^-13) = 12.33

To learn more about : NaOH

https://brainly.com/question/28504849

#SPJ11

The concentrations of major species in a mixture of weak and strong acids and bases are determined by their dissociation behavior and interaction in a solution, influencing the overall pH and buffering capacity.

The relationship among the concentrations of major species in a mixture of weak and strong acids and bases can be understood through their dissociation and interaction in a solution.

Strong acids, such as HCl, fully dissociate in water, releasing a high concentration of H+ ions. Similarly, strong bases, like NaOH, dissociate completely, releasing a high concentration of OH- ions.

Weak acids, such as acetic acid (CH3COOH), only partially dissociate in water, releasing a smaller concentration of H+ ions. Likewise, weak bases, like ammonia (NH3), partially dissociate, releasing a smaller concentration of OH- ions.

When a mixture of weak and strong acids and bases is present, the strong species will react first due to their higher concentrations of H+ or OH- ions. This reaction will affect the pH of the solution, as well as the concentrations of the weak species, as they will be buffered by the strong species.

To learn more about buffering capacity click here

brainly.com/question/24188850

#SPJ11

The acid dissociation constant (Ka) for uric acid is [tex]1.0 x 10^-5.[/tex]

The dissociation of uric acid can be represented as follows:

H2UA ⇌ H+ + HUA

The equilibrium expression is given by:

Ka = [H+][HUA-]/[H2UA]

where Ka is the acid dissociation constant, [H+] is the concentration of hydrogen ions, [HUA-] is the concentration of the urate ion, and [H2UA] is the concentration of uric acid.

At equilibrium, the concentration of H2UA is equal to the initial concentration minus the concentration of H+ ions that have been consumed:

[H2UA] = 0.110 - [H+]

The concentration of HUA- can be calculated from the equation:

[HUA-] = [H+]

Substituting the above expressions into the equilibrium expression for Ka, we get

[tex]Ka = ([H+]^2) / (0.110 - [H+])[/tex]

Substituting [H+] = 3.4 x 10^-2 M, we get:

[tex]Ka = [(3.4 x 10^-2)^2] / (0.110 - 3.4 x 10^-2)[/tex]

[tex]Ka = 1.0 x 10^-5[/tex]

Therefore, the acid dissociation constant (Ka) for uric acid is [tex]1.0 x 10^-5.[/tex]

Learn more about dissociation constant

https://brainly.com/question/28197409

#SPJ4

The total number of joules of heat energy needed to raise the temperature of 10 grams of water from 20°C to 30°C is 418.4 J. The specific heat capacity of water is 4.184 J/g·°C.

To find the total heat energy needed, we can use the formula:

Q = m·c·ΔT

where:

Q = heat energy (in Joules)

m = mass of the water (in grams)

c = specific heat capacity of water (4.184 J/g·°C)

ΔT = change in temperature (in °C)

Substituting the values given, we get:

Q = 10 g × 4.184 J/g·°C × (30°C - 20°C)

Q = 418.4 J

Therefore, the total number of joules of heat energy needed to raise the temperature of 10 grams of water from 20°C to 30°C is 418.4 J.

Learn more about heat energy

https://brainly.com/question/29210982

#SPJ4

The volume of 4.50 moles of nitrogen gas at STP is approximately 101 L. So, the correct answer is 101 L.

At STP (standard temperature and pressure), the volume of one mole of any gas is 22.4 liters. Therefore, to find the volume of 4.50 moles of nitrogen gas at STP, we can simply multiply the number of moles by the molar volume:

At STP (Standard Temperature and Pressure), the volume of 4.50 moles of nitrogen gas (N2) can be calculated using the ideal gas law:

PV = nRT

Where P is the pressure (which is 1 atm at STP), V is the volume, n is the number of moles, R is the gas constant, and T is the temperature (which is 273.15 K at STP).

Rearranging this equation to solve for V, we get:

V = (nRT)/P

Substituting the values for n, R, P, and T, we get:

V = (4.50 mol x 0.08206 L atm K^-1 mol^-1 x 273.15 K)/1 atm

V = 101.3 L

For such more questions on STP:

https://brainly.com/question/27100414

#SPJ11

(a) If one of the reaction products was the then unknown neutron, what was the other product is the C -12.

(b) The q-value of this reaction is the 5.9 × 10⁸ J.

The James Chadwick was discovered the neutron during the experiment involving the nuclear reaction in that the beryllium, bombarded with the alpha particles. The equation of the reaction is as :

⁴Be₉  +  ²He₄  ---->  ⁶C₁₂  +  ⁰n₁

(a) If one of the reaction products was the then unknown neutron, what was the other product is the C -12.

(b) The q-value of this reaction is as :

q = mc²

Where,

The m is the mass

The c is the speed of the light.

m = 4.002603 + 2.014102

m = 1.988501

q = 1.988501  × 3 × 10⁸

q = 5.9 × 10⁸ J

To learn more about James Chadwick here

https://brainly.com/question/14559793

#SPJ4

The heat capacity of 28.4 g of water is 118.8976 J/°C. The closest option to this answer is option b) 119 J/°C.

To calculate the heat capacity of 28.4 g of water, we need to use the formula:

Heat capacity = mass x specific heat

where mass is given as 28.4 g and specific heat of water is given as 4.184 J/g.°C.

So, substituting the values in the formula, we get:

Heat capacity = 28.4 g x 4.184 J/g.°C
Heat capacity = 118.8976 J/°C


To calculate the heat capacity of 28.4 g of water, you need to multiply the mass of water (m) by its specific heat (c). The formula for heat capacity (Q) is:

Q = m × c

Given:
m = 28.4 g
c = 4.184 J/g.°C

Substitute the values and perform the calculation:

Q = 28.4 g × 4.184 J/g.°C = 118.8 J/°C

The closest answer among the given options is:

b) 119 J/°C

To learn more about mass of water click here

brainly.com/question/26789700

#SPJ11

The average repeat unit molecular weight for average molecular weight of 229,500 g/mol and a number degree of polymerization of 4,000 is equals to the 57.4 g/mol. So, option(c) is right one.

Polymers are large molecules made up of repeating structural units linked together. The degree of polymerization (DP) is the number of repeating units in the polymer molecule. The average molecular weight is the degree of polymerization (MP) multiplied by the molecular weight of the repeat unit (m) is written as [tex] \bar M_n = (DP)(m)[/tex]

We have a random copolymer produced by polymerization of vinyl chloride and propylene.

Average molecular weight= 229500 g/mol

Number degree of polymerization = 4000

Using the above formula, the average repeat unit molecular weight = 229500 g/mol/ 4000

= 57.37 ~ 57.4 g/mol

Hence, required value is 57.4 g/mol.

For more information about degree of polymerization, visit :

https://brainly.com/question/30751495

#SPJ4

Immiscible two-component solvent systems containing water, dichloromethane, and diethyl ether are perfect for solvent extraction.

Because they are miscible with water and do not produce a distinct layer, methanol and ethanol are not effective extraction solvents.

A versatile technique that is both easy to use and sensitive is solvent extraction. The evidence container is opened, and a tiny amount of a suitable solvent is introduced (the amount will depend on how much debris is in the container). The most widely used solvent for this procedure is carbon disulfide.

To know more about dichloromethane visit:-

https://brainly.com/question/25413988

#SPJ1

Ozone  is the primary absorber of UV radiation in the 150-200 nm range in the upper atmosphere, and its depletion can have significant consequences for life on Earth.

UV radiation with wavelengths between 150-200 nm is highly energetic and can cause damage to living cells by breaking chemical bonds and damaging DNA. Therefore, it is important to prevent most of this radiation from reaching the Earth's surface where it can harm living organisms.

In the upper atmosphere, ozone (O3) plays a crucial role in absorbing this harmful UV radiation through the process of photodissociation. When a molecule of ozone absorbs a photon of UV radiation, it undergoes photodissociation or photolysis, which results in the dissociation of the ozone molecule into an oxygen molecule (O2) and an oxygen atom (O):

O3 + hv -> O2 + O

This process is highly efficient and can absorb more than 97% of the incoming UV radiation in the 150-200 nm range. The oxygen atoms produced in this process can then react with other oxygen molecules to form more ozone, thereby replenishing the ozone layer and continuing this protective cycle.

While other molecules such as nitrogen (N2) and oxygen (O2) can also absorb UV radiation in this range, they are much less efficient at doing so compared to ozone. Therefore, ozone is the primary absorber of UV radiation in the 150-200 nm range in the upper atmosphere, and its depletion can have significant consequences for life on Earth.

Visit to know more about Ozone:-

brainly.com/question/5019112

#SPJ11

The chemical symbol for the ion with an atomic anion and a charge of -1, and electron configuration of 2s22p5 is Cl⁻. The Cl⁻ ion has 18 electrons.

This is because the electron configuration matches that of the element chlorine, which is found in group 7 of the periodic table. The Cl⁻ ion is formed when chlorine gains an extra electron to fill its valence shell and achieve a stable octet configuration.

The Cl⁻ ion has 18 electrons in total, as it has gained one extra electron compared to the neutral chlorine atom. The ion now has a full outer shell with 8 electrons, making it stable and less reactive than its neutral counterpart.

The Cl⁻ ion is commonly found in nature, particularly in the form of sodium chloride (NaCl) or table salt. The Cl⁻ ion is also used in various chemical processes, such as in the production of bleach and other disinfectants. Overall, the Cl⁻ ion plays an important role in many chemical reactions and is essential for maintaining the balance of charges in various compounds.

know more about electron configuration here

https://brainly.com/question/29757010#

#SPJ11