Thermodynamic properties of liquids, including solutions. XVI. Structures and thermodynamic properties of simple liquids

Abstract

Abstract It is assumed that a real liquid, composed of simple molecules, behaves thermodynamically like a hypothetical liquid in which the contacts between neighboring molecules (at a given temperature) all have the same “contact energy” and the same “contact distance.” Intramolecular energies and the energies of interaction between noncontacting molecules are neglected. The molal energy is related to the contact energy, the contact distance, and the (average) contact number by an equation in which the attraction energy is of the London type and the repulsion energy is of the exponential Born-Mayer-Huggins form. The (four constant and one temperature dependent) parameters in the assumed equation have been evaluated for benzene from experimental measurements (from the literature) of the enthalpy of vaporization and the density. Using entropy data from the literature, Gibbs energies and other properties derivable therefrom can be calculated. The calculated results are for the whole liquid range of temperatu...