At 298 ,K, the reaction has an equilibrium constant . In one experiment the…

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

Problem

At 298\,K, the reaction PCl5(g)⇌PCl3(g)+Cl2(g)\mathrm{PCl_5(g) \rightleftharpoons PCl_3(g) + Cl_2(g)} has an equilibrium constant Kc=0.041K_c = 0.041. In one experiment the equilibrium concentrations of PCl5\mathrm{PCl_5} and PCl3\mathrm{PCl_3} are found to be 0.255 M0.255\,\text{M} and 0.100 M0.100\,\text{M}, respectively. What is the equilibrium concentration of Cl2(g)\mathrm{Cl_2(g)}? (a) 0.041 M0.041\,\text{M} (b) 0.395 M0.395\,\text{M} (c) 0.105 M0.105\,\text{M} (d) 0.016 M0.016\,\text{M}

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