Consider the following reaction: COCl₂(g) ⇌ CO(g) + Cl₂(g)
A reaction mixture initially contains 1.6 M COCl₂.Determine the equilibrium concentration of CO if K_c for the reaction at this temperature is 8.33 × 10^-4.Calculate this based on the assumption that the answer is negligible compared to 1.6.

Question

Quizplus · Accepted Answer

Let x be the concentration of CO and Cl2 at equilibrium. Then, at equilibrium:

Kc = [CO][Cl2] / [COCl2] = (x)(x)/(1.6 - x)

We can approximate (1.6 - x) to be 1.6 since the answer is assumed to be negligible compared to 1.6.

8.33 × 10^-4 = x^2/1.6

x^2 = 1.33 × 10^-6

x = 3.65 × 10^-4 M

Therefore, the equilibrium concentration of CO is 3.7 × 10^-2 M, which corresponds to choice C.

Consider the Following Reaction: COCl2(g)⇌ CO(g)+ Cl2(g)

Consider the Following Reaction: COCl₂(g)⇌ CO(g)+ Cl₂(g)