Heat capacities of binary and ternary mixtures containing o-chlorotoluene, cyclic ether and aromatic hydrocarbons

Molar heat capacities, C P 123 and C P mix , have been measured for the ternary o-chlorotoluene (1) + tetrahydropyran (2) + benzene or toluene or o-xylene (3) and their binaries tetrahydropyran (1) + benzene or toluene or o-xylene (2) at 298.15, 303.15 and 308.15 K and atmospheric pressure. From the experimental results, excess heat capacities, C P E and C P E 123 values were calculated and fitted to Redlich–Kister equation to determine binary and ternary adjustable parameters along with standard deviations. The observed C P E and C P E 123 data have been analyzed by utilizing topology of the constituent molecules (Graph theory). The estimated C P E and C P E 123 values from Graph theory are in agreement with experimental values. The interaction parameters, χ* and χ 12 / for binary mixtures (simulated by Graph theory) have been discussed to obtain information about molecular interactions in mixtures.