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Question

If S0 for H2, Cl2 and HCL are 0.13, 0.22 and 0.19 kJK-1mol-1 respectively. The total change in standard entropy for th2e reaction, H2+Cl22HCl


  1. 40 J K-1mol-1
  2. 30 J K-1mol-1
  3. 60 J K-1mol-1
  4. 20 J K-1mol-1


Solution

The correct option is B 30 J K-1mol-1

∆S = Sp - SR

(2×0.19) - 0.13 - 0.22

= 0.03 KJK-1mol-1

=30 K-1mol-1

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