Excess Molar Enthalpies of Binary Mixtures of Trichloroethylene with Six 2-Alkanols at 25°C

Excess molar enthalpies HE have been measured for the binary mixtures trichloroethylene + 2-propanol, + 2-butanol, + 2-pentanol, + 2-hexanol, + 2-heptanol, and + 2-octanol using an isothermal microcalorimeter at 25°C. All the mixtures present exothermic events and showed minimum negative HE values around 0.50–0.60 mole fraction of trichloroethylene. Minimum values of HE vary from 450 J-mol−1 up to 530 J-mol−1 depending on the molecular weight of alkanol. The results are explained in terms of the strong self-association exhibited by the 2-alkanols and the formation of aggregates between unlike molecules through O···HO hydrogen bonding. The experimental results for mixtures are well represented by the Redlich–Kister, NRTL, and Wilson equations, respectively.