Abstract
With the linear mixing rule for a covolume parameter of a cubic equation of state, the calculated excess thermodynamic properties depend on the cohesion parameter only at the specified temperature, pressure and mole fractions. Any cubic equation of state with modified conventional mixing rules gives similar predictions of the excess molar enthalpy and the excess molar volume. The excess thermodynamic property calculations are strongly dependent on the binary interaction parameters of the modified conventional mixing rules. A new method to predict a mixture thermodynamic property is proposed which combines a cubic equation of state for the excess property and a correlation method or experimental data for the pure property.
