What is the value of the equilibrium constant for the reaction 2 NO 2 (g) N 2 O 4 (g) at 100 o C? N 2 O 4 (g) 2 NO 2 (g) K c = 0.212 @ 100 o C?

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 What is the value of the equilibrium constant for the reaction 2 NO2(g)  N2O4(g) at 100o C?

N2O4(g)  2 NO2(g)   Kc = 0.212 @ 100oC?