For the equilibrium reaction at constant 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 equilibrium reaction N2O4(g)⇌2 NO2(g)\mathrm{N_2O_4(g) \rightleftharpoons 2\,NO_2(g)} at constant temperature, an additional amount of NO2\mathrm{NO_2} is injected so that its concentration increases instantaneously while the concentration of N2O4\mathrm{N_2O_4} is unchanged. Which of the following best describes the immediate effect on the reaction quotient QcQ_c and the subsequent shift of the system? (a) Qc>KcQ_c>K_c; the reaction will shift toward NO2\mathrm{NO_2} (b) Qc=KcQ_c=K_c; the reaction will not shift (c) Qc>KcQ_c>K_c; the reaction will shift toward N2O4\mathrm{N_2O_4} (d) Qc<KcQ_c<K_c; the reaction will shift toward NO2\mathrm{NO_2}

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