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JEE Advanced2006ChemistryThermodynamics (C)Actual

The direct conversion of A to B is difficult, hence it is carried out by the following shown path. Given S_ (A C) =50 eu , S_ (C D) =30 eu , S_ (B D) =20 eu where eu is entropy unit, then S_ (A B) is

Options

  1. A+100 eu
  2. B+60 eu
  3. C-100 eu
  4. D-60 eu

Correct answer

B. +60 eu

Step-by-step solution

Given: S_ (A C) =50 eu , S_ (C D) =30 eu , S_ (B D) =20 eu where eu is entropy unit. Therefore, aligned S_ (A B) & = S_ (A C) + S_ (C D) + S_ (D B) & = S_ (A C) + S_ (C D) - S_ (B D) & =50+30-20=60 eu aligned

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