For the gaseous reaction

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 gaseous reaction 2 NO2(g)⇌N2O4(g)2\,\mathrm{NO}_{2}(g)\rightleftharpoons\mathrm{N}_{2}\mathrm{O}_{4}(g), which of the following expressions represents the reaction quotient QQ at a given moment? (a) Q=[NO2]2[N2O4]Q=\dfrac{[\mathrm{NO}_{2}]^{2}}{[\mathrm{N}_{2}\mathrm{O}_{4}]} (b) Q=[N2O4][NO2]Q=\dfrac{[\mathrm{N}_{2}\mathrm{O}_{4}]}{[\mathrm{NO}_{2}]} (c) Q=[N2O4]2[NO2]Q=\dfrac{[\mathrm{N}_{2}\mathrm{O}_{4}]}{2[\mathrm{NO}_{2}]} (d) Q=[N2O4][NO2]2Q=\dfrac{[\mathrm{N}_{2}\mathrm{O}_{4}]}{[\mathrm{NO}_{2}]^{2}}

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