Molar excess enthalpies, H-ijk(E), of nitrobenzene (i) + benzene (j) cyclohexane or +n-hexane or + n-heptane (k) ternary mixtures have bee
n measured as a function of composition at 308.15 K. The observed data
have been analysed in terms of i) Flory's theory and ii) Sanchez and
Lacombe theory of fluid mixtures. H-ijk(E) values predicted by Flory t
heory and Sanchez and Lacombe theory make only qualitative agreement.