Excess Enthalpies of {CH₃(CH₂)_nCN,n= 5 to 12} + Methyl Methylthiomethyl Sulfoxide or + Dimethyl Sulfoxide at 298.15 K

Abstract

Excess enthalpies of binary mixtures between each of {CH 3 (CH 2 ) n CN (n ) 5-12)} and methyl methylthiomethyl sulfoxide or dimethyl sulfoxide have been determined at 298.15 K. All mixtures show positive enthalpy changes over the whole range of mole fractions. Excess enthalpies of the mixtures of nitriles increased with increasing size of the aliphatic groups. The increments of dipole interaction terms of µ 1 2 µ 2 2 (r 1 + r 2 ) -6 on excess partial molar enthalpies at infinite dilution showed different behavior on the border of pentanenitrile.

Thermodynamic properties of ethanol solution of chiral camphors and its derivatives

“…The excess enthalpies of mixing and dilution were measured by a microcalorimeter (Thermometric AB, Järfälla, Sweden) with a 0.8 Á 10 À3 dm 3 mixing vessel at T = 298.15 K [13][14][15]. The enthalpies of solution of propane-1-ol in water were used as a test reaction [14] for the calorimetric measurements.…”

“…The enthalpies of solution of propane-1-ol in water were used as a test reaction [14] for the calorimetric measurements. In addition, another reliability test of the microcalorimeter system and the procedures used had been performed using a binary mixture of {(1 À x)1,4-dimethybenzene + x1,3-dimethylbenzene} and {(1 À x)1,4-dimethylbenzene + x1,2-dimethylbenzene} as reported previously [15] for the exothermic and endothermic systems. Details of the calorimetric procedure have been described previously [11][12][13][14][15].…”

“…In addition, another reliability test of the microcalorimeter system and the procedures used had been performed using a binary mixture of {(1 À x)1,4-dimethybenzene + x1,3-dimethylbenzene} and {(1 À x)1,4-dimethylbenzene + x1,2-dimethylbenzene} as reported previously [15] for the exothermic and endothermic systems. Details of the calorimetric procedure have been described previously [11][12][13][14][15]. The sample densities were measured using a vibrating-tube densitometer (Anton Paar DMA60) at T = (298.15 ± 0.001) K. The details of the densitometric procedures were the same as those described previously [16].…”

Thermodynamic Properties of d- and l-Tartaric Acid in Aqueous and Ethanol Solution at 298.15 K

“…When it reached equilibrium temperature, the injection experiments were initiated. Details of the calorimetric procedure have been described previously. , The enthalpies of solution of propane-1-ol in water was used as a test reaction for the calorimetric measurements. Also other reliability test of the microcalorimeter system and the procedures used had been performed using a binary mixture of (1 − x )1,4-dimethybenzene + x 1,3-dimethylbenzene and (1 − x )1,4-dimethybenzene and x 1,2-dimethylbenzene as reported previously for exothermic and endothermic system.…”