Excess molar volumes, excess molar enthalpies, and excess isentropic compressibilities of tetrahydropyran with aromatic hydrocarbons

Excess molar volumes VE, excess molar enthalpies HE, and speeds of sound u, data of {tetrahydropyran (i) + benzene, or toluene, or o-, or p-, or m-xylene (j)} binary mixtures have been measured as a function of composition at a temperature of 308.15 K. Speeds of sound data have been utilized to predict excess isentropic compressibilities, κSE. VE, HE, and κSE data for the investigated mixtures have been analyzed in terms of the Graph theory which in turn deals with topology of the constituents of mixtures. An analysis of VE data in terms of Graph theory suggests that these mixtures are characterized by interactions between dipole of tetrahydropyran and π-electron cloud of aromatic ring of aromatic hydrocarbons to form 1:1 molecular complex. It has been observed that VE, HE, and κSE values predicted by the Graph theory compare well with their corresponding experimental values.