COMBUSTION CALORIMETRY ON SAMPLES OF MASS ABOUT 5 MG OF SUBSTANCES CONTAINING CHLORINE WITH A CRMT ROCKING-BOMB CALORIMETER - APPLICATION TO THE STUDY OF P-CHLOROBENZOIC ACID

Wishing to extend its possibilities, we have used the CRMT rocking cal orimeter in association with a microbomb to determine the enthalpy of combustion of a sample of low mass (about 5 mg) of a substance contain ing chlorine. p-Chlorobenzoic acid, p-ClC6H4COOH, a candidate as refer ence material for combustion calorimetry of substances containing chlo rine, has been investigated. The value - (3063.3 +/- 1.5) kJ . mol(-1) for its molar enthalpy of combustion obtained with this apparatus is in good agreement with the authors' and literature values obtained by classical combustion calorimetry.