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Consider the following reaction PCl5 = PCl3 + Cl2 Kc=0.042 The concentrations of the products at...

Consider the following reaction PCl5 = PCl3 + Cl2 Kc=0.042 The concentrations of the products at equilibrium are [PCl3] = 0.260 M and [Cl2] = 0.200 M. What is the concentration of the reactant, PCl5, at equilibrium?

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