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For the gas phase reaction, P C l 5 ( g ) ⇌ P C l 3 ( g ) + C l 2 ( g ) Which of the following conditions are correct?

Options

  1. AΔ H < 0 and Δ S < 0
  2. BΔ H > 0 and Δ S < 0
  3. CΔ H = 0 and Δ S < 0
  4. DΔ H > 0 and Δ S > 0

Correct answer

D. Δ H > 0 and Δ S > 0

Step-by-step solution

Gas phase reaction P C l 5 ( g ) ⇌ P C l 3 ( g ) + C l 2 ( g ) Δ H = Δ E + Δ n g R T Δ n = change in number of moles of product and reactant species. Since Δ n g = + v e , hence Δ H = + v e also one mole of P C l 5 is dissociated into two moles of P C l 3 and C l 2 in the same phase. Therefore, Δ S = S p r o d u c t - S r e a c t a n t Δ S = + v e

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