Discussion
A binary at a given composition has activity coefficients of 1.5 and 1.2 with mole fractions 0.4 and 0.6. Taking the gas constant times temperature as 2500 joules per mole, what is the excess Gibbs energy?
Answer: C
The excess Gibbs energy is the gas constant times temperature times the mole-fraction weighted sum of the logarithms, which is about four tenths of point four one plus six tenths of point one eight. Multiplying by twenty-five hundred gives roughly six hundred and eighty.
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