Thermochemical properties of naphthalene compounds I. Enthalpies of combustion and formation of the 1- and 2-naphthoic acids

Abstract

The energies of combustion of 1-naphthoic and 2-naphthoic acids were determined using a static bomb calorimeter. The sublimation vapour pressures were measured in a given temperature range by the Knudsen effusion technique. The formation enthalpies in the crystalline state at 298.15 K and the sublimation enthalpies at the mean temperature of the measurement ranges were derived for the two acids. The values obtained are: 1-naphthoic acid 79.71 ± 0.25 −26.38 ± 0.05 (at 350.5 K) 2-naphthoic acid 82.71 ± 0.35 −27.15 ± 0.19 (at 355.6 K)