Combustion calorimetry on samples of mass about 7 mg of substances containing bromine with a CRMT rocking-bomb calorimeter. Application to the study of p-bromobenzoic acid

Abstract

Wishing to extend its possibilities, we have used a CRMT rocking calorimeter associated with a microbomb to determine the enthalpy of combustion of a sample of low mass (about 7 mg) of a substance containing bromine. p-Bromobenzoic acid, p-BrC 6H 4COOH, a candidate as reference material for combustion calorimetry of substances containing bromine, has been investigated. The value of −(3090.1 ± 1.3)kJ ·mol −1for its molar enthalpy of combustion obtained with this apparatus is in very good agreement with the two literature values obtained by classical rotating-bomb combustion calorimetry ( m≈ 1 g for each combustion).