EXCESS THERMODYNAMIC PROPERTIES OF ASYMMETRIC MULTICOMPONENT MIXTURES- PREDICTIVE MODELS AND MICROSCOPIC INSIGHT FOR THE SYSTEM ETHANOL PLUS TETRAHYDROFURAN PLUS CYCLOHEXANE AT 25-DEGREES-C

A general picture of the excess thermodynamic properties G(m)(E), H-m( E), S-m(E), C-p,m(E), and V-m(E), for the ternary mixture ethanol + te trahydrofuran + cyclohexane is presented and discussed. Emphasis is pl aced on the advantages for interpretation inherent in the contemporane ous observation of all these properties. The trend of the excess entro py and heat capacity reveals the nearly competitive behaviour of the t wo polar compounds with respect to the hydrocarbon in terms of order-d isorder creation. Partial molar quantities of ethanol illustrate the p henomena associated with the presence of hydrogen bonds, while calcula tion of the Kirkwood-Buff integrals allows quantitative estimation of the local compositions. Lastly, some methods for predicting the thermo dynamic properties of multicomponent mixtures are considered.