Thermodynamics Research Center / ThermoML | Thermochimica Acta

ABSTRACT

Molar excess enthalpies ( ) at 298.15 K and 308.15 K and molar excess volumes ( ) at 308.15 K for formamide (1) + 1-propanol or 2-propanol (2) mixtures have been measured over the entire composition range. The excess enthalpies and excess volumes data have been utilized to study the thermodynamics of molecular interactions in terms of Prigogine-Flory-Patterson theory and Treszczanowicz-Benson association model with a Flory contribution term. In this paper, this Treszczanowicz-Benson association model was applied, for the first time, to binary mixtures containing both components associated (propanol and formamide) through hydrogen bonding. In both the cases, when either of formamide or propanol was assumed to be associated, the calculated and values compared well with corresponding experimental data. Extent of inter-molecular H-bonding in formamide and propanols in their binary mixtures was also reflected in their molar enthalpy of association of H-bonding and association constant .