For a sample of a perfect gas when its pressure is changed isothermally from Pi to Pf, the entropy change is given by:

1. s=nR ln pfpi

2. s=nR ln pipf

3. s=nRT ln pfpi

4. s=RT ln pipf

Subtopic:  Spontaneity & Entropy |
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Level 2: 60%+
NEET - 2016
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