Abstract
Molar excess volumes, V E, molar excess enthalpies, H E, and speeds of sound, u, of o-toluidine ( i) + cyclohexane or n-hexane or n-heptane ( j) binary mixtures have been determined over entire range of composition at 308.15 K. Speeds of sound data have been utilized to predict isentropic compressibility changes of mixing, κ S E of ( i + j) mixtures. The observed V E, H E and κ S E data have been analyzed in terms of Graph theory. The analysis of V E data by Graph theory reveals that o-toluidine exists as an associated molecular entity and ( i + j) mixtures contain 1:1 molecular complex. It has been observed that V E, H E and κ S E values calculated by Graph theory compare well with their corresponding experimental values. The observed data have also been analyzed in term of Flory theory.
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