ABSTRACT
In the case of mixtures of components of commensurate size each site can be contain only one particle: either a molecule grade i, or a vacancy. The equations of equilibrium distribution of molecules in the bulk phase allow to estimate the compressibility factor of the mixture based on information about individual properties of gases. The lattice–gas model (LGM) can be successfully used to describe mixtures of low–molecular substances in a wide range of densities and temperatures, if they obey the law of corresponding states. For mixtures, the density of the coexisting vapour and liquid phases of the adsorbate was determined by Maxwell’ relationships, as for pure substanes. The critical temperature of the binary mixture increases with increasing mole fraction of the component having a higher critical temperature. The LGM was used to calculate the thermodynamic and kinetic characteristics of the binary mixtures of molecules of the same size, the shape of which differs only slightly from spherical.
