Intermolecular interactions in ternary liquid mixtures by ultrasonic measurements

The excess adiabatic compressibility ([beta] super(E)), excess free length (L sub(f) super(E)), excess free volume (V sub(f) super(E)) and excess internal pressure ([pi] sub(i) super(E)) have been investigated from density, ultrasonic velocity and viscosity measurements for three ternary mixtures of methyl benzoate + cyclohexane + 1-propanol, methyl benzoate + cyclohexane + 1-butanol, methyl benzoate + cyclohexane +l-pentanol and methyl benzoate + cyclohexane + 1-hexanol at 303, 308 and 313 K and atmospheric pressure, respectively over the entire range of composition. From the experimental data, adiabatic compressibility (([beta]), free length (L sub(f)), free volume (V sub([eta])), internal pressure ([pi] sub(i)), have been calculated. The results are discussed in terms of the molecular interactions between the components of the mixture.