Problem: Four substances (HCl, I 2, HI, and Cl 2) are mixed in a reaction vessel and allowed to reach equilibrium in the following reaction:2 HCl (g) + I 2 (s) ⇋ 2 HI (g) + Cl 2 (g)Certain change is then made to this mixture. Considering the change, select the effect (increase, decrease, or no change) that the change has on the original equilibrium value of the quantity. The temperature and volume are constant, unless otherwise specified. This reaction is exothermic. Please circle the letter of the correct answer.Change: Decrease volume          Quantity: amount of HI (g)          Effect:a. increasesb. decreasesc. no change

FREE Expert Solution

We are asked to identify the effect of decreasing the volume to the amount of HI(g).


Decreasing the volume results in increasing pressure. In this situation, the reaction will shift to the side with fewer moles of gas. 


Volume-Pressure-Reverse


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Problem Details

Four substances (HCl, I 2, HI, and Cl 2) are mixed in a reaction vessel and allowed to reach equilibrium in the following reaction:

2 HCl (g) + I 2 (s) ⇋ 2 HI (g) + Cl 2 (g)

Certain change is then made to this mixture. Considering the change, select the effect (increase, decrease, or no change) that the change has on the original equilibrium value of the quantity. The temperature and volume are constant, unless otherwise specified. This reaction is exothermic. Please circle the letter of the correct answer.

Change: Decrease volume          Quantity: amount of HI (g)          Effect:

a. increases

b. decreases

c. no change

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