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AP EAMCET2008ChemistryChemical Equilibrium

In a 500 ~mL flask, the degree of dissociation of PCl ₅ at equilibrium is 40 % and the initial amount is 5 moles. The value of equilibrium constant in mol L ⁻¹ for the decomposition of PCl ₅ is

Options

  1. A2.33
  2. B2.66
  3. C5.32
  4. D4.66

Correct answer

B. 2.66

Step-by-step solution

aligned & PCl ₅ PCl ₃+ Cl ₂ initial moles & .5(1)^5 ) 5 5 moles at equilibrium & 5(1- ) 0.5 5 0.5 5 0.5 conc at equilibrium & =40 % & =0.4 & K_c= [ PCl ₃ ] [ Cl ₂ ] [ PCl ₅ ] & = ( 5 0.4 0.5 ) ( 5 0.4 0.5 ) ( 5 0.6 0.5 ) = 16 6 & =2.66 ~mol / L & aligned

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