A study of the system,
4 QH3(g) + 7 O2(g) 2 Q2O4(g) + 6 H2O(g)
was carried out. A system was prepared with [QH3] = [O2] = 3.61 M as the only components initially. At equilibrium, [Q2O4] is 0.572 M. Calculate the value of the equilibrium constant, Kc, for the reaction.