Gibbs free energy of mixing at constant pressure and temperature is always__________________?
Correct answer: A. - ve
- A. - ve
- B. ∞
- C. + ve
- D. 0
Explanation
Mixing stable, unlike components at constant temperature and pressure lowers Gibbs free energy, so ΔGmix is negative. For an ideal mixture this follows from ΔGmix = RTΣxi ln xi, since each xi is less than one.
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