STUDY OF MOLECULAR INTERACTION IN MIXTURE OF N, NDIMETHYLFORMAMIDE, CYCLOHEXANE AND BENZENE FOR DIFFERENT FREQUENCIES OF ULTRSONIC WAVES

The density, viscosity and ultrasonic velocity of ternary liquid mixtures of N,Ndimethylformamide,cyclohexane and benzene have been measured at different frequencies (2MHz,4MHz and 6MHz) using a multi frequency ultrasonic interferometer over the entire range of molefraction at temperature 318 K. The data have been utilized to compute the acoustical parameterssuch as adiabatic compressibility (β), free length (Lf), free volume (Vf), internal pressure (Пi),relaxation time (τ), acoustic impedance (Z), and Gibb’s free energy (ΔG) and their excess values,using the standard relations. The variations of sound speed with frequency plays a key role inanalyzing the intermolecular interactions present in the ternary mixture. The results have beeninterpreted in terms of molecular interactions existing between the components of the mixtures.