Consider an ideal solution of components A and B. The entropy of mixing per mole of an alloy containing 50% B is_______________?
Correct answer: B. R ln 2
- A. -R ln 2
- B. R ln 2
- C. 3 R ln 2
- D. -3R ln 2
Explanation
For an ideal equimolar binary mixture, the molar entropy of mixing is -R[xA ln xA + xB ln xB] = -R[2(0.5 ln 0.5)] = R ln 2. Mixing entropy is positive because mixing increases molecular disorder.
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