Question

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

• A. $△S=nRT$ ln $\frac{P_f}{P_i}$
• B. $△S=RT$ ln $\frac{P_i}{P_f}$
• C. $△S=nR$ ln $\frac{P_f}{P_i}$
• D. $△S=nR$ ln $\frac{P_i}{P_f}$

Answer 1

The correct option is D $△S=nR$ ln $\frac{P_i}{P_f}$