Low-Temperature Heat Capacities and Derived Thermodynamic Functions of 1,4-Dichlorobenzene, 1,4-Dibromobenzene, 1,3,5-Trichlorobenzene, and 1,3,5-Tribromobenzene

The heat capacities of 1,4-dichlorobenzene, 1,4-dibromobenzene, and 1,3,5-trichlorobenzene from 5 K to
380 K and 1,3,5-tribromobenzene from 5 K to 410 K were measured by adiabatic calorimetry. The
experimental data were used to calculate the molar entropy and enthalpy values relative to 0 K. Apart
from 1,4-dichlorobenzene, the substances do not show any solid−solid transitions. Molar enthalpies of
fusion and melting-point temperatures were determined. The results, given in order, are (17 907 ± 15)
J·mol-1 and (326.24 ± 0.03) K, (20 387 ± 15) J·mol-1 and (360.48 ± 0.03) K, (17 557 ± 35) J·mol-1 and
(335.92 ± 0.03) K, and (21 721 ± 20) J·mol-1 and (394.96 ± 0.07) K.