A sealed reaction vessel at 400 °C contains a mixture at equilibrium for the reaction…

CHEMISTRY · Single correct · AP · Chemistry · Equilibrium · Equilibrium

Problem

A sealed reaction vessel at 400 °C contains a mixture at equilibrium for the reaction N2(g)+3 H2(g)⇌2 NH3(g)\mathrm{N_2(g) + 3\,H_2(g) \rightleftharpoons 2\,NH_3(g)} A pulse of additional H2\mathrm{H_2} gas is injected rapidly into the vessel at constant temperature and volume. Which of the following best describes the relationship between the reaction quotient QcQ_c immediately after the injection and the equilibrium constant KcK_c, and the direction in which the system will subsequently proceed? (a) Qc>Kc;Q_c > K_c; the system will shift toward the left (toward reactants) (b) Qc<Kc;Q_c < K_c; the system will shift toward the right (toward NH3\mathrm{NH_3}) (c) Qc=Kc;Q_c = K_c; the system will remain at equilibrium with no net shift (d) Qc<Kc;Q_c < K_c; the system will shift toward the left (toward reactants)

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