Molecular thermodynamics of solutions in the normal and critical regions — II. Activity coefficients for the ArN2, C2H6C2H4 and C3H6CO2 systems

Activity coefficients for the ArN₂, C₂H₆C₂H₄, and C₃H₆CO₂ systems are calculated from published vapour-liquid equilibrium compositions at various pressures and temperatures. The activity coefficients are correlated using a two parameter model based on the principles of molecular thermodynamics. The method is used both in the normal liquid and critical regions. The parameters of the model are shown to be reasonably independent of the temperature for the three systems.