Phosphorous pentachloride decomposes according to the reaction   PCl5(g)↽−−⇀PCl3(g)+Cl2(g) A 13.9 g sample of PCl5 is added to a sealed 1.50 L flask and the reaction is allowed to come to equilibrium at a constant temperature. At equilibrium, 40.0% of the PCl5 remains. What is the equilibrium constant, ?c , for the reaction? K= ???

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