Topological and thermodynamic investigations of mixtures containing o-chlorotoluene and lower amides

Graphical abstract: Heat capacities of mixtures, CPmix at T/K = 298.15 for (I) o-Chlorotoluene (i) + formamide (j) Exptl. (▪); (II) o-Chlorotoluene (i) + N-methylformamide (j) Exptl. (▪); (III) o-Chlorotoluene (i) + N,N-dimethylformamide (j) Exptl. (▪). Highlights: • ρ, u, HE and CPE of the investigated mixtures were measured. • The observed data have been employed to determine VE, κSE. • The observed data have been fitted to Redlich–Kister equation. • The observed data have been analyzed in terms of Graph, PFP and Sanchez Lacombe's theories. -- Abstract: Excess molar volumes, VE, excess isentropic compressibilities, κSE (obtained from the measured density, ρ and speed of sound, u data), excess heat capacities, CPE of o-chlorotoluene (i) + formamide or N-methylformamide or N,N-dimethylformamide (j) binary mixtures at T = (298.15. 303.15, 308.15) K and excess molar enthalpies, HE of the same (i + j) mixtures at T = 308.15 K have been determined/measured over entire mole fraction using density and sound analyzer (DSA-5000) and micro differential scanning calorimeter [Model-μ DSC 7 Evo]. The VE, κSE,HE and CPE data have been analyzed in terms of (a) Graph; (b) Prigogine–Flory–Patterson; and (c) Sanchez–Lacombe's theories. It has been observed that VE, κSE, HE and CPE values calculated from Graph theory compare well with their experimental values