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NEET2016ChemistryThermodynamics (C)Actual

For a sample of perfect gas, when its pressure is changed isothermally from p i to p f , the entropy change is given by

Options

  1. A∆ S = n Rln ⁡ p f p i
  2. B∆ S = nRln ⁡ p i p f
  3. C∆ S = n R T ln ⁡ p f p i
  4. D∆ S = R T ln ⁡ p i p f

Correct answer

B. ∆ S = nRln ⁡ p i p f

Step-by-step solution

For a sample of perfect gas, when its pressure is changed isothermally from p i to p f , the entropy change is given by ∆ S = n R ln ⁡ p i p f Here, p i stands for initial pressure and p f stands for the final pressure.

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