Abstract
Thermodynamic properties of ethane, propane, n-butane and n-pentane are calculated using interaction-site models and the high temperature approximation to the exact expansion of Helmholtz free energy. The models are predictive in the dense liquid region with basically a single adjustable parameter fixed against a single experimental point. Theoretical limitations of the theory are discussed and a possible improvement in the calculation of contact values for hard homonuclear diatomics is suggested.
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