There are several possible expressions that can be used for the Gibbs excess energy. One is the

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There are several possible expressions that can be used for the Gibbs excess energy. One is the Redlich-Kister expansion 

Gex = x1x2 {A+B(x  x2) + C(x - x)}

where B = 0, but A and C are nonzero. Find expressions for the activity coefficients for this excess Gibbs energy model in which γ1 is given solely in terms of x2 and the parameters A and C, and γ2 only in terms of x1, A, and C.

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