Abstract We revisit Guggenheim's theory to demonstrate that the change in Gibbs energy of athermally mixing molecules can be generalized into a model that requires only the mole fraction, volume… Click to show full abstract
Abstract We revisit Guggenheim's theory to demonstrate that the change in Gibbs energy of athermally mixing molecules can be generalized into a model that requires only the mole fraction, volume and contact area of the various molecules. Subsequently, we obtain a general formula for the combinatorial activity coefficient for mixtures of molecules differing in size and shape.
               
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