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

Mar 2, 2017

#### Answer:

${K}_{c} = \frac{\left[{H}_{2} O \left(g\right)\right]}{\left[{H}_{2} \left(g\right)\right]}$

#### 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.