The equilibrium constant is given for one of the reactions b…

The equilibrium constant is given for one of the reactions below. Determine the value of the missing equilibrium constant.         2 SO2(g) + O2(g) ⇌ 2 SO3(g)           Kc = 1.7 × 106        SO3(g) ⇌ 1/2 O2(g) + SO2(g)           Kc = ?