Excess molar volume, excess energy and viscosity deviation of binary mixtures of tetrahydrofuran with some hydrocarbons at various temperatures

Department of Chemistry, University of North Bengal, Darjeeling-734 430, India E-mail : mahendraroy2002@yahoo.com Manuscript received 1 July 2004, revised 1 November 2004, accepted 1 April 2005 The density and viscosity of the binary mixtures of tetrahydrofuran with normal pentane, hexane and heptane have been measured as a function of the composition at 288.15, 293.15 and 298.15 K. From these data, excess molar volume, excess free energy, deviation in viscosity of the composition and the interaction parameter of Grunberg and Nissan have been calculated. All the derived parameters are found to be either negative or positive over the entire range of composition depending on the molecular interactions and the nature of the binary liquid mixtures. The results have been interpreted in terms of possible molecular interactions existing between the components of these mixtures