Thermochemical and topological investigations of ternary mixtures containing ether

Molar excess volumes, V-ijk(E) and ultrasonic speed U-ijk, of 1,3-dioxolone (i) + benzene (j) or toluene or + o- and + p-xylene (k) ternary mixtures h ave been measured by dilatometer and quartz-crystal interferometer as a fun ction of composition at 298.15K. The measured values of ultrasonic speed ha ve been employed to evaluate molar excess compressibilities, (K-s(E))(ijk). The observed data have been analysed in terms of (i) Graph-theoretical app roach (based on Moelywn-Huggins concept) and (ii) Flory's theory. It has be en observed that V-ijk(E) and (K-s(E))(ijk) values calculated by Graph appr oach compare better with their corresponding experimental values than the M -ijk(E) and (K-s(E))(ijk) values evaluated by Flory theory.