In the catalytic converter of an automobile exhaust system, some SO2 is converted to SO3 by the reaction
SO2(g) + ½ O2(g) ? SO3(g)
If one starts with [SO2] = 3.0 x 10-3 M and if the [O2] remains constant at 1.0 x 10-3 M, what will be the equilibrium concentration of SO3? (Kc = 20.0)