Excess molar enthalpies for binary and ternary mixtures containing cyclic ether, 2-methylaniline and aromatic hydrocarbons

Excess molar enthalpies, image, of 1,4-dioxane (i) + 2-methylaniline (j) + benzene or methylbenzene or 1,3-dimethylbenzene or 1,4-dimethylbenzene (k) ternary and image of 1,4-dioxane (i) + 1,3-dimethylbenzene or 1,4-dimethylbenzene (k) binary mixtures have been measured as a function of composition at T = 308.15 K using 2-drop calorimeter. The resulting data have been fitted to Redlich–Kister equation to evaluate binary and ternary parameters along with their standard deviations. The observed data have been analyzed in terms of (a) Graph theory (which involve the topology of the mixtures constituents), and (b) Prigogine–Flory–Patterson theory. It has been observed that image and image values predicted by Graph theory compare well with their corresponding experimental values. However, although image values calculated by Prigogine–Flory–Patterson theory are of same sign, the qualitative agreement is not impressive.