Question Bank MCQ • 2 Marks Section 5: Thermodynamics & Statistical Physics Thermodynamics & Statistical Physics - Module 4

QB_PH_139: Thermodynamics & Statistical Physics - Module 4

Question Statement

When two equal volumes of two distinct ideal gases mix at identical temperature and pressure, the entropy change per mole of mixture is:
(A) R \ln(2)
(B) 2 R \ln(2)
(C) 0
(D) R / 2
Correct Answer
A
Verified Key

Step-by-Step KaTeX Derivation & Detailed Explanation

### Solution: $\Delta S_{mix} = -R(0.5\ln 0.5 + 0.5\ln 0.5) = R\ln 2$.
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