Abstract
A new expression for free energy of mixing is proposed. This equation contains a repulsive part (entropy term) and an attractive part (internal energy term). The entropy of mixing is Guggenheim's random-mixing term. The energy of mixing is a simple, exponentially-weighted, surface-fraction-averaged energy. It is shown that the attractive term is simple, yet accurate. Comparisons are made with Flory theory, Guggenheim's random-mixing approximation, Guggenheim's quasichemical theory, lattice cluster theory, Born-Green-Yvon formalism and experimental data for real systems. This equation provides good results for phase equilibrium calculations, energies of mixing and activities
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