For the reaction at a fixed temperature

CHEMISTRY · Single correct · A Level · Chemistry · Chemical equilibria (Le Chatelier’s principle and Kc) · Chemical equilibria (Le Chatelier’s principle and Kc)

Problem

For the reaction 2NO2(g)  ⇌  N2O4(g)2\text{NO}_2(g)\;\rightleftharpoons\;\text{N}_2\text{O}_4(g) at a fixed temperature, which expression correctly represents the equilibrium constant KcK_c in terms of molar concentrations? (a) Kc=[NO2]2[N2O4]K_c = \dfrac{[\text{NO}_2]^2}{[\text{N}_2\text{O}_4]} (b) Kc=[N2O4][NO2]2K_c = \dfrac{[\text{N}_2\text{O}_4]}{[\text{NO}_2]^2} (c) Kc=[N2O4]2[NO2]2K_c = \dfrac{[\text{N}_2\text{O}_4]^2}{[\text{NO}_2]^2} (d) Kc=[N2O4][NO2]K_c = \dfrac{[\text{N}_2\text{O}_4]}{[\text{NO}_2]}

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