For the reaction at a fixed temperature

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

Problem

For the reaction PCl5(g)⇌PCl3(g)+Cl2(g)\text{PCl}_5(g)\rightleftharpoons \text{PCl}_3(g)+\text{Cl}_2(g) at a fixed temperature, an initial PCl5\text{PCl}_5 concentration of 0.300 M0.300\,\text{M} is introduced into a container. At equilibrium, 40\% of the original PCl5\text{PCl}_5 has dissociated. Determine the value of the equilibrium constant KcK_c for the reaction at this temperature.

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