TEMPERATURE-DEPENDENCE OF MOLAR EXCESS VOLUMES AND EXCESS THERMAL-EXPANSION COEFFICIENTS FOR BINARY-MIXTURES OF CYCLOHEXANE WITH SOME HYDROCARBONS BETWEEN 298.15-K AND 313.15-K

An apparatus for measuring liquid density at various temperatures was constructed using a vibrating-tube densimeter, and using this apparatus, densities were measured for binary mixtures of cyclohexane + benzene, + toluene, + ethylbenzene and + heptane at temperature range from 298.15 to 313.15 K. Molar excess volumes, VE, for these mixtures were determined from the density data. They show the positive values for all the systems. The temperature dependence of excess volumes was positive for benzene and toluene systems but negative for the other systems. Excess thermal expansion coefficients, αE, for these mixtures were also evaluated from the temperature dependence of VE. αE were obviously negative except for the cyclohexane rich region in the benzene and the toluene systems. © 1990.