Excess Thermodynamic Properties of Binary Liquid Mixtures of Dimethyl Carbonate with Xylene

The experimental data of density and viscosity of the binary liquid mixtures of Dimethyl Carbonate (DMC) with o-xylene and m-xylene have been explored over the entire composition range at atmospheric pressure and four different temperatures (298.15 K, 303.15 K, 308.15 K & 313.15 K) to calculate excess molar volume (VE), deviation in viscosity (Δη) and excess Gibbs energy of activation (GE). The interaction parameters have been estimated by correlating the experimental viscosity data using the McAllister equation. The experimentally determined values of VE, Δη, and GE have been fitted to the Redlich-Kister polynomial equation to calculate coefficients and standard error values. The variation in thermodynamic properties with the composition and temperature of the binary mixtures has been discussed in terms of intermolecular interactions. The density of both binary liquid mixtures, i.e., DMC + o-xylene and DMC + m-xylene, decreases with an increase in temperature and increases as the mole fraction of DMC increases. Still, viscosity decreases with an increase in temperature and an increase in the mole fraction of DMC in both mixtures. This paper will help the reader to improve their practical skills, understanding of chemical thermodynamics principles, and ability to interpret experimental data and identify trends.