Write the equilibrium constant expression for each of the following reactions.
In each case, indicate which of the reaction is homogeneous or heterogeneous.
(a) 2CO(g) +O2(g) ⇌2CO2(g)
(b) N2O5(g) ⇌ NO2 (g) + NO3(g)
(c) Zn(s) + 2HCl (g) ⇌ZnCl2(s) +H2(g)
(d) 2H2O(l) ⇌2H2O (l) + O2(g)
