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JIPMER2006ChemistryThermodynamics (C)

The entropy values (in JK ⁻¹ ~mol ⁻¹ ) of H ₂( ~g )=130.6, Cl ₂( ~g )=223.0 and HCl ( g )=186.7 at 298 K and 1 atm pressure. Then entropy change for the reaction : H ₂( ~g )+ Cl ₂( ~g ) 2 HCl ( g ) is :

Options

  1. A+540.3
  2. B+727.3
  3. C-166.9
  4. D+19.8

Correct answer

D. +19.8

Step-by-step solution

aligned S^ & =2 S^ _ HCl - (S_ H ₂ ^ +S^ _ Cl ₂ ) & =2 186.7-(130.6+223.0) & =19.8 JK ⁻¹ ~mol ⁻¹ aligned

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