Abstract
The enthalpies of dissolution of cobalt(II) chloride, acetonitrile, and adducts in ethanol at 298.15 K have been calorimetrically measured to determine the standard enthalpy of the reaction: CoCl 2(s) + nCH 3CN(l) = Co(CH 3CN) n Cl 2(s); which gave the following ΔH R θ /(kJ·mol −1) values: Co(CH 3CN) 3Cl 2, −(47.32±0.76); Co(CH 3CN) 2Cl 2, −(34.07±0.80); and Co(CH 3CN)Cl 2, −(22.92±0.78). For the same sequence of adducts, the standard enthalpies of formation of the adducts were calculated: −294.8, −265.3, and −238.0 kJ·mol −1. Special attention was devoted to the standard enthalpy of the partial and total decomposition reaction: Co(CH 3CN) n Cl 2(s) = CoCl 2(s) + nCH 3CN(g), as well as to comparing our results with those of d.s.c. and vapour-pressure measurements.
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