NO and O2 are mixed in a container of fixed volume kept at 1000 K. Their initial concentrations are 0.0200 mol/L and 0.0300 mol/L, respectively. When the reaction
2 NO(g) + O2(g) « 2 NO2(g)
has come to equilibrium, the concentration of NO2 is 2.2 x 10-3 mol/L. Calculate the equilibrium constant Kc for the reaction