The gas-phase decomposition of phosphorus pentachloride is represented by A 3.00 ,L…

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

Problem

The gas-phase decomposition of phosphorus pentachloride is represented by PCl5(g)⇌PCl3(g)+Cl2(g)\mathrm{PCl_5(g)} \rightleftharpoons \mathrm{PCl_3(g)} + \mathrm{Cl_2(g)} A 3.00\,L reaction vessel at 425\,K initially contains 1.50\,mol of PCl5\mathrm{PCl_5} and no products. When equilibrium is reached, 1.10\,mol of PCl5\mathrm{PCl_5} remain. Determine the numerical value of KcK_c at 425\,K.

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