Discussion
Match each mixing property with its value for an ideal solution.
List I
A. Volume of mixing
B. Enthalpy of mixing
C. Entropy of mixing
D. Gibbs energy of mixing
List II
1. positive
2. zero
3. negative
4. zero
Answer: A
The first two vanish because ideal mixing changes no interactions, while the entropy rises simply from the greater number of arrangements. That entropy is what makes the Gibbs energy of mixing negative and mixing spontaneous.
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