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Multiple Choice
A container is charged with 2.00 mol of I2 and is allowed to reach equilibrium. The I2 decomposes to iodine atoms as shown in the following reaction: I2 (g) ⇆ 2 I (g) After the reaction reaches equilibrium, an inert gas is introduced into the container under conditions of constant volume. Which of the following would you expect to happen?
A
[I2] will decrease.
B
The partial pressure of I2 will increase.
C
[I] will increase.
D
The partial pressure of I will increase.
E
No change; the reaction is at equilibrium.
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Verified step by step guidance
1
Understand the concept of equilibrium: At equilibrium, the rates of the forward and reverse reactions are equal, meaning the concentrations of reactants and products remain constant over time.
Consider the effect of adding an inert gas: Adding an inert gas at constant volume does not affect the concentrations of the reactants or products because it does not change the partial pressures of the reacting gases.
Analyze the reaction: The decomposition of I2 into iodine atoms is represented by the equation: . At equilibrium, the concentrations of I2 and I are stable.
Evaluate the options: Since the reaction is at equilibrium and the addition of an inert gas does not affect the equilibrium position, none of the concentrations or partial pressures of I2 or I will change.
Conclude: The correct answer is that there will be no change in the concentrations or partial pressures of I2 and I because the system is already at equilibrium and the inert gas does not affect the equilibrium state.