Equilibrium constants K1 and K2 for the following equilibria are
NO(g) + 0.5O2(g) →K1 NO2(g) and 2NO2(g) →K2 2NO(g) + O2(g)
K2 = 1/K1
K2 = K12
K2 = (K1)/2
K2 = 1/K12
K1 = [NO2][NO][O2]0.5 and
K2 = [NO]2[O2][NO2]2
Or K2 = 1K21