Write the equilibrium constant expression for each of the following reactions.

a CO(g) + H2O(g) YZZ ZZX CO2(g) + H2(g)

b CH4(g) + Cl2(g) YZZ ZZX CH3 Cl(g) + HCl(g)

c 2SO2(g) + O2(g) YZZ ZZX 2SO3(g)

d FeO(s) + CO(g) YZZ ZZX Fe(s) + CO2(g)