Thermodynamics of mixtures of aromatic hydrocarbons with alkanols studied by light scattering

Measurement of light scattering of mixtures of aromatic hydrocarbons (benze ne, toluene, ethylbenzene) and alkanols (methanol, ethanol, propan-1-ol, bu tan-1-ol, pentan-1-ol) having sufficiently different refractive indices, pr oduced rather reliable thermodynamic data. From these data it was possible to deduce the composition dependence of the change in Gibbs energy of mixin g DeltaG(mix). These dependences were measured for eleven binary mixtures. A model of alcohol molecules forming linear aggregates which are in equilib rium was developed and used for interpretation of the data. All DeltaG(mix) data for the eleven mixtures as well as the DeltaH(mix) data obtained for these mixtures from literature could be interpreted using just two values t hat characterized the Gibbs energy and enthalpy of the formation of hydroge n bonds. The analysis also yielded plausible results concerning the contact interactions.