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

1. $∆ s = nR$ $\ln$ $(\frac{p_{f}}{p_{i}})$

2. $∆ s = nR$ $\ln$ $(\frac{p_{i}}{p_{f}})$

3. $∆ s = nRT$ $\ln$ $(\frac{p_{f}}{p_{i}})$

4. $∆ s = RT$ $\ln$ $(\frac{p_{i}}{p_{f}})$

Subtopic: Spontaneity & Entropy |

73%

Level 2: 60%+

NEET - 2016

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