EXCESS THERMODYNAMIC AND ACOUSTIC PROPERTIES FOR EQUIMOLAR MIXTURE OF METHYL BENZOATE AND ALKANOLS WITH BENZENE AT 303.15 K

— Densities ( ), viscosity ( ) and speed of sound (U) values for the liquid mixture systems of ethyl benzoate + 1-propanol/1-butanol/1-pentanol with benzene including those of pure liquids were measured over the entire mole fraction range at T=303.15 K. From these experimentally determined values, various thermo-acoustic parameters such as excess isentropic compressibility (K sE ), excess molar volume (V ) and excess free length (L fE ), excess Gibb’s free energy ( G *E ) and excess enthalpy (H E ) have been calculated. The excess functions have been fitted to the Redlich – Kister type polynomial equation. The deviations for excess thermo-acoustic parameters have been explained on the basis of the intermolecular interactions present in these liquid mixtures. The theoretical values of speed of sound in these mixtures have been evaluated using various theories and has been compared with experimentally determined speed of sound values in order to check the applicability of such theories to the liquid mixture systems under study. Viscosity data has been used to test the applicability of standard viscosity models of Grunberg-Nissan, Hind-Mc Laughlin, Katti-Chaudhary, Heric and Brewer, Frenkel and Tamura and Kurata for the liquid systems under study.