Refractive Indices for the system• benzene-cyclohexane, acetone-benzene, and acetone-cyclohexane have been measured at 25 °C over the composition range. These results, combined with the corresponding densities published earlier by us, were used to test the applicability of the Lorentz-Lorenz, Gladstone-Dale, Wiener, Heller, and Arago-Blot refractive Index mixing rules. The Lorentz-Lorenz relation gave the best correlation for all systems Investigated. The specific refractivities for mixtures studied were also calculated.

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Refractive index and density for (acetone + benzene + cyclohexane) at 298.15 K are reported. Changes of refractivity and of volume on mixing over the composition range were derived. Relations for predicting these changes were established and analyzed.

Densities data of n-hexane, toluene and dichloromethane at temperatures 288.15-413.15 K and at pressures 0.1-60 MPa, determined in our previous work, were fitted to the modified Tait equation of state. The fitted temperature-pressure dependent density data were used to calculate the derived properties: the isothermal compressibility, the isobaric thermal expansivity, the difference between specific heat capacity at constant pressure and at constant volume and the internal pressure, over the entire temperature and pressure intervals specified above. In order to assess the proposed modeling procedure, a comparison of the obtained values for the isothermal compressibility and the isobaric thermal expansivity with the corresponding literature data were performed. The average absolute percentage deviations for isothermal compressibility were: for n-hexane 2.01-3.64%, for toluene 0.64-2.48% and for dichloromethane 1.81-3.20%; for the isobaric thermal expansivity: for n-hexane 1.31-4.17%, for toluene 0.71-2.45% and for dichloromethane 1.16-1.61%. By comparing the obtained deviations values with those found in the literature it can be concluded that the presented results agree good with the literature data. [Projekat Ministarstva nauke Republike Srbije, br. 172063]

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