Volumetric behaviour of binary liquid mixtures at a temperature of 303.15 K

Excess molar volumes (V_m^E) of binary liquid mixtures: xC₆H₅CH₃ + (1-x₁)CH₃CN or + (1-x₁)C₆H₅NO₂, or + (1-x₁)C₂H₅NO₂, have been determined as a function of mole fraction of C₆H₅CH₃ (x) at a temperature of 303.15 K over a entire range of composition. The densities of the binary liquid mixtures were determined by pycnometrically. The V_m^E values of the mixtures have been found to be negative over the whole composition in order of C₆H₅CH₃ + C₆H₅NO₂, < C₆H₅CH₃ + CH₃CN, and < C₆H₅CH₃ + C₂H₅NO₂. The negative magnitude of V_m^E suggests the presence of intermolecular interaction in the three binary liquid mixtures.