An equilibrium mixture for the reaction is at 500 K with

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

Problem

An equilibrium mixture for the reaction CO(g)+Cl2(g)  ⇌  COCl2(g)\text{CO}(g)+\text{Cl}_2(g)\;\rightleftharpoons\;\text{COCl}_2(g) is at 500 K with Kc=1.2×103K_c = 1.2\times10^3. Additional COCl2\text{COCl}_2 is quickly injected, doubling its concentration while the concentrations of CO\text{CO} and Cl2\text{Cl}_2 remain initially unchanged. Which of the following describes the relationship between QcQ_c and KcK_c immediately after the injection and predicts the subsequent shift of the net reaction? (a) Qc<KcQ_c < K_c; the net reaction will form more COCl2\text{COCl}_2 (shift right). (b) Qc>KcQ_c > K_c; the net reaction will form more COCl2\text{COCl}_2 (shift right). (c) Qc>KcQ_c > K_c; the net reaction will consume COCl2\text{COCl}_2 (shift left). (d) Qc=KcQ_c = K_c; the system is still at equilibrium and no shift will occur.

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