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Ch.15 - Chemical Equilibrium
Chapter 15, Problem 74c

When 2.00 mol of SO2Cl2 is placed in a 2.00-L flask at 303 K, 56% of the SO2Cl2 decomposes to SO2 and Cl2: SO2Cl2(𝑔) ⇌ SO2(𝑔) + Cl2(𝑔) (c) According to Le Châtelier's principle, would the percent of SO2Cl2 that decomposes increase, decrease or stay the same if the mixture were transferred to a 15.00-L vessel?

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Identify the initial conditions: 2.00 mol of SO_2Cl_2 in a 2.00-L flask, which means the initial concentration is 1.00 M.
Determine the change in concentration due to decomposition: 56% of SO_2Cl_2 decomposes, so calculate the concentration of SO_2 and Cl_2 formed.
Apply Le Châtelier's principle: Consider how a change in volume affects the equilibrium position. Increasing the volume decreases the pressure.
Analyze the reaction: The decomposition of SO_2Cl_2 results in an increase in the number of gas molecules (from 1 to 2), which means the reaction will shift to the right to counteract the decrease in pressure.
Conclude the effect: Since the reaction shifts to the right, the percent of SO_2Cl_2 that decomposes will increase when transferred to a 15.00-L vessel.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Chemical Equilibrium

Chemical equilibrium occurs when the rates of the forward and reverse reactions are equal, resulting in constant concentrations of reactants and products. In this state, the system can respond to changes in conditions, such as concentration, temperature, or pressure, which can shift the equilibrium position according to Le Châtelier's principle.
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Le Châtelier's Principle

Le Châtelier's principle states that if a dynamic equilibrium is disturbed by changing the conditions, the system will adjust to counteract the change and restore a new equilibrium. This principle helps predict how the concentration of reactants and products will change in response to alterations in volume, pressure, or temperature.
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Effect of Volume on Gas Equilibrium

When the volume of a gas reaction system is increased, the equilibrium will shift toward the side with more moles of gas to counteract the change. In the given reaction, the decomposition of SO<sub>2</sub>Cl<sub>2</sub> produces two moles of gas (SO<sub>2</sub> and Cl<sub>2</sub>) from one mole of SO<sub>2</sub>Cl<sub>2</sub>, indicating that increasing the volume will favor the formation of products.
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Related Practice
Open Question
If Kc = 1 for the equilibrium 2A ⇌ B, what is the relationship between [A] and [B] at equilibrium?
Open Question
A mixture of CH4 and H2O is passed over a nickel catalyst at 1000 K. The emerging gas is collected in a 5.00-L flask and is found to contain 8.62 g of CO, 2.60 g of H2, 43.0 g of CH4, and 48.4 g of H2O. Assuming that equilibrium has been reached, calculate Kc and Kp for the reaction CH4(g) + H2O(g) ⇌ CO(g) + 3H2(g).
Textbook Question

When 2.00 mol of SO2Cl2 is placed in a 2.00-L flask at 303 K, 56% of the SO2Cl2 decomposes to SO2 and Cl2: SO2Cl2(𝑔) ⇌ SO2(𝑔) + Cl2(𝑔) (a) Calculate 𝐾𝑐 for this reaction at this temperature.

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Open Question
The value of the equilibrium constant Kc for the reaction N2(g) + 3 H2(g) ⇌ 2 NH3(g) changes in the following manner as a function of temperature: Temperature (°C) Kc 300 9.6 400 0.50 500 0.058. (b) Use the standard enthalpies of formation given in Appendix C to determine the ΔH for this reaction at standard conditions. Does this value agree with your prediction from part (a)?
Textbook Question

A sample of nitrosyl bromide (NOBr) decomposes according to the equation 2 NOBr(𝑔) ⇌ 2 NO(𝑔) + Br2(𝑔) An equilibrium mixture in a 5.00-L vessel at 100°C contains 3.22 g of NOBr, 3.08 g of NO, and 4.19 g of Br2. (b) What is the total pressure exerted by the mixture of gases?

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Textbook Question

A sample of nitrosyl bromide (NOBr) decomposes according to the equation 2 NOBr(𝑔) ⇌ 2 NO(𝑔) + Br2(𝑔) An equilibrium mixture in a 5.00-L vessel at 100°C contains 3.22 g of NOBr, 3.08 g of NO, and 4.19 g of Br2. (c) What was the mass of the original sample of NOBr?

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