Discussion
The two-parameter Margules equation is best described as
Answer: C
Correct answer: an empirical expansion of excess Gibbs energy
Margules writes the excess Gibbs energy as a polynomial in composition and obtains the activity coefficients by differentiation. It is a correlation with adjustable constants rather than a theory - it fits binary data well and predicts nothing about a system it has not been fitted to, which is what distinguishes it from the models based on local composition.
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