The effect of the size and packing of molecules on the thermodynamic properties of mixtures

The suggested approach explains the concentration dependence of density and of bulk-and-elastic properties of thermodynamically ideal mixture from the structural standpoint. It is demonstrated that the deviations of the concentration dependence of volumetric density and of the coefficient of isothermal compressibility from the mole-additive rule are caused by the difference between the structure parameters of pure liquids contained in the mixture (molecular volume, packing factors, and molecular densities). The contribution made by each one of the structure parameters to the deviation of the behavior of density of thermodynamically ideal mixture from the mole-additive rule is identified and estimated within suggested simulation for mixtures of different types.