For the reaction at 400 K,

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 reaction PCl5(g)⇌PCl3(g)+Cl2(g)\mathrm{PCl_5(g)\rightleftharpoons PCl_3(g)+Cl_2(g)} at 400 K, Kc=0.042K_c=0.042. A 10.0 L10.0\,\text{L} vessel initially contains 1.00 mol1.00\,\text{mol} of PCl5\mathrm{PCl_5} and no products. After equilibrium is reached, 0.100 mol0.100\,\text{mol} of Cl2\mathrm{Cl_2} is quickly removed from the vessel (volume and temperature remain constant). By what percentage does the equilibrium concentration of PCl3\mathrm{PCl_3} increase relative to its original equilibrium value after the system re-establishes equilibrium? (a) 11%11\% (b) 7.9%7.9\% (c) 21%21\% (d) 3.7%3.7\%

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