At a certain temperature the following reactions have the constants shown:
S (s) + O2 (g) SO2 (g) Keq = 4.2 x 105
2S (s) + 3O2 (g) 2SO3 (g) Keq = 9.8 x 1012
Calculate the equilibrium constant Keq for the following reaction at that temperature:
2SO2 (g) + O2 (g) 2SO3 (g)