The equilibrium constant expression for the following reaction
CuO(s) + H₂(g) ⇌ Cu(s) + H₂O(g) is K_c = [H₂]/[H₂O].

Question

The equilibrium constant expression for the following reaction CuO(s) + H₂(g) ⇌ Cu(s) + H₂O(g) is K_c = [H₂]/[H₂O].

Quizplus · Accepted Answer

The equilibrium constant expression, $K_c$, for a reaction only includes the concentrations of gases and aqueous solutions. Since CuO(s) and Cu(s) are solids, they do not appear in the expression. The correct expression should involve the concentrations of the gaseous species only, and it should be $K_c = \frac{[HS_{2}O]}{[H_2S]}$, assuming H₂ and H₂O are meant to represent H2S and H2SO, respectively.

The Equilibrium Constant Expression for the Following Reaction