Second-order excess derivatives for liquid mixtures of non-electrolytes

Abstract

Densities, iseutropic compressibility coefficients, and isobaric molar heat capacities of the cyclohexane+ n-tetradecane binary system were measured throughout the composition range at atmospheric pressure and temperatures of 288.15, 293.15, 298.15 and 308.15 K. Density data were used to obtain thermal expansion coefficients and, via appropriate thermodynamic relations, isothermal compressibility coefficients and isochoric molar heat capacities. The excess quantities for these properties were calculated using the ideality criterion of Benson and Kiyohara. The isothermal compressibility coefficients obtained are compared with reported values in order to assess the reliability of the procedure. The loss of the orientational order in n-tetradecane affects the excess properties of the mixture.