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COMEDK2014ChemistryChemical Equilibrium

One mole of PCl ₅ is heated in a closed 2 dm ³ vessel. At equilibrium 40 % PCl ₅ is dissociated. Calculate the equilibrium constant.

Options

  1. A0.066
  2. B0.154
  3. C0.133
  4. D0.266

Correct answer

C. 0.133

Step-by-step solution

PCl ₅ PCl ₃+ Cl ₂ Initial conc. 1 2 =0.5 0 0 Equili. conc. 1-0.4 2 = 0.6 2 0.4 2 0.4 2 K_ C = [ PCl ₃ ] [ Cl ₂ ] [ PCl ₅ ] = 0.4 2 0.4 2 0.6 2 = (0.4)² 2 0.6 =0.133

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