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A sample of pure PCl5 was introduced into an evacuated vessel at 473 K. After equilibrium was attained, concentration of PCl5 was found to be 0.5 × 10–1 mol L–1. If value of Kc is 8.3 × 10–3, what are the concentrations of PCl3 and Cl2 at equilibrium? 

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Let the concentrations of both PCl3 and Cl2 at equilibrium be x molL–1. The given reaction is: 

Now we can write the expression for equilibrium as: 

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