Collect. Czech. Chem. Commun. 1999, 64, 1093-1099

On Temperature Dependence of Excess Gibbs Energy

Ivona Malijevská* and Anatol Malijevský

Department of Physical Chemistry, Prague Institute of Chemical Technology, Technická 5, 166 28 Prague 6, Czech Republic


Temperature dependence of GE is discussed for three widely used equations linear and nonlinear in parameters. It is shown that the Wilson equation predicts always positive excess heat capacity regardless of values of its parameters. Several temperature modifications of the Redlich-Kister, Wilson and NRTL equations are discussed with respect to the sign of the excess Gibbs energy, excess enthalpy and excess heat capacity.

Keywords: Liquid mixtures; Excess functions; Temperature dependence; Chemical thermodynamics.