What is the expression for Kc for the following reaction: 4HCl(aq) + O2(g) ⇌ 2H2O(l) + 2Cl2(g)?
a) [H2O]^2[Cl2]^2 / [HCl]^4[O2]
b) [H2O]^2[Cl2]^2 / [HCl]^2[O2]
c) [H2O]^2[Cl2] / [HCl]^4[O2]
d) [H2O][Cl2] / [HCl]^4[O2]