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Molar Heat Capacities of Binary Liquid Mixtures: 1,2‐Dichlorethane + Benzene, + Toluene, and + p‐Xylene

1977; Volume: 81; Issue: 10 Linguagem: Inglês

10.1002/bbpc.19770811009

0005-9021

Emmerich Wilhelm, J.-P.E. Grolier, Masood Ghassemi,

Phase Equilibria and Thermodynamics

Abstract The molar heat capacity at constant pressure C P for the binary mixtures 1,2‐dichloroethane(x 1 ) + benzene, + toluene, and + p‐xylene, were determined at 298.15 K from measurements of volumetric heat capacity in a Picker flow microcalorimeter. For the molar excess heat capacity C E P , the precision of the adopted stepwise procedure is ±0.03 JK −1 mol −1 (1 ‐ 2% in C E P !). Literature data on ultrasonic velocities, on molar volumes and on coefficients of thermal expansion were used to calculate the molar heat capacity at constant volume C v , the isothermal compressibility β T , and the corresponding excess quantities C E V and ( V β T ) E . A discussion of our results in terms of external and internal rotational behavior (trans‐gauche equilibrium of 1,2‐dichloroethane) is presented.