Question

What is the equilibrium constant expression for the following reaction? `FeO(s) + H_2(g) rightleftharpoons Fe(s) + H_2O(g)`?

Answer 1

`K_c=([H_2O(g)])/([H_2(g)])`

Explanation:

Because ferrous oxide and iron are solids, they cannot express a concentration, and thus they do not appear in the equilibrium expression. The equilibrium depends solely on the concentrations, or partial pressures, of water, and dihydrogen.