Excess Parameters of the Binary Mixtures for Benzonitrile+1-Propanol at 298.15, 308.15 and 318.15 K

Densities(ρ), Viscosities(η) and ultrasonic velocities(u) of binary mixtures of Benzonitrile with 1-propanol were determined using bicapillary pyknometer, Ostwald's Viscometer and ultrasonic interferometer respectively in temperature range of 298.15 to 318.15 K at intervals of 10K. The excess molar volume (V^E), excess viscosities (η^E), excess Gibbs free energy of activation of viscous flow (G^*E), excess isentropic compressibility (K_S^E), excess internal pressure (π_i^E) and excess enthalpy (H^E) have been calculated from the experimental values of ρ, η and u. The results are discussed to explain the strength of interactions between component molecules in the binary mixture taken for study. The data was correlated by using Redlich-Kister polynomial equation stating their dependence on temperature and composition of the mixtures. These properties are used to illustrate the nature of interaction between component molecules.