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3 International Letters of Chemistry, Physics and Astronomy

3 2012

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Theoretical evaluation of internal pressure in ternary and sub-binary liquid mixtures at various temperatures

100%

Madhumitha J. , Santhi N. , Alamelumangai G. , Emayavaramban M.

tom Vol. 4

82-95

The Internal pressures of Ternary and their sub-Binary liquid mixtures of benzene(1) + hexane(2) + sec-butyl alcohol(3) were calculated using density, velocity and molar refraction from the temperature range of 303.15K-318.15K. For the Binary liquid mixtures, the Experimental Internal pressure values were correlated through an equation proposed by Andiappan et.al. For the Ternary liquid mixture, the Experimental Internal pressure values were correlated through an equation proposed by us. The Experimental values and the Theoretical values are in close agrement with each other.

Estimation of internal pressure of liquids and liquid mixtures

88%

Santhi N. , Sabarathinam P. , Alamelumangai G. , Madhumitha J. , Emayavaramban M.

tom Vol. 5

1-7

By combining the van der Waals' equation of state and the Free Length Theory of Jacobson, a new theoretical model is developed for the prediction of internal pressure of pure liquids and liquid mixtures. It requires only the molar volume data in addition to the ratio of heat capacities and critical temperature. The proposed model is simple, reliably accurate and capable of predicting internal pressure of pure liquids with an average absolute deviation of 4.24% in the predicted internal pressure values compared to those given in literature. The average absolute deviation in the predicted internal pressure values through the proposed model for the five binary liquid mixtures tested varies from 0.29% to 1.9% when compared to those of literature values.

Ultrasonic study of molecular interaction in binary liquid mixtures of n-hexane with alcohols

88%

Santhi N. , Sabarathinam P. , Alamelumangai G. , Madhumitha J. , Emayavaramban M.

tom Vol. 5

59-71

Ultrasonic velocity, viscosity and density of alcohol[s] in n-hexane have been measured AT various temperatures in the range of 303.15 - 318.15K. From the experimental data, the acoustical parameters such as molar volume, adiabatic compressibility, intermolecular free length and their excess values have been computed and presented as functions of compositions. The deviations from ideality of the acoustical parameters are explained on the basis of molecular interactions between the components of the mixtures. The variations of these parameters with composition of the mixture suggest the strength of interactions in these mixtures.