C(s) + H_2 (g) doubleheadarrow CO(g) + H_2 Delta H degree = + 131 kJ A rigid con

Question

C(s) + H_2 (g) doubleheadarrow CO(g) + H_2 Delta H degree = + 131 kJ A rigid container holds a mixture of graphite pellets (C(s)), H_2O(g). CO(g), and H_2(g) at equilibrium. State whether the number of moles of CO(g) in the container will increase, decrease, or remain the same after each of the following disturbances is applied to the original mixture. For each ease, assume that all other variables remain constant except for the given disturbance. Explain each answer with a short statement. Additional H_2(g) is added to the equilibrium mixture at constant volume. The temperature of the equilibrium mixture is increased at constant volume. The volume of the container is decreased at constant temperature. The graphite pellets are pulverized.

Explanation / Answer

answer

a. Additional H2(g) is added to the equilibrium mixture at constant volume.

Decrease.

Additional H2 causes the reaction to shift left.

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b. The temperature of the equilibrium mixture is increased at constant volume.

Increase.

The reaction is endothermic, additional heat shifts the reaction to the right.

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c. The volume of the container is decreased at constant temperature.

Decrease.

Decreasing the volume increases the pressure and shifts the reaction left to where there are fewer moles of gas.

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d. The graphite pellets are pulverized.

Remain the same.

Pulverizing carbon does not affect the equilibrium position.

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