The energies of combustion of benzenesulfonamide (cr), o-toluenesulfonamide (cr), p-toluenesulfonamide (cr), 2-aminobenzenesulfonamide (cr), and 4-aminobenzenesulfonamide were determined using a combustion rotating-bomb calorimeter. The molar energies of combustion for these compounds in the condensed phase at T = 298.15 K were determined as: -(3611.4 +/- 1.8) kJ . mol(-1), -(4280.7 +/- 1.1) kJ . mol(-1), -(4458.8 +/- 1.5) kJ . mol(-1), -(3745.7 +/- 1.2) kJ . mol(-1) and -(3725.6 +/- 1.9) kJ . mol(-1), respectively. From these values, corresponding standard molar enthalpies of formation were obtained as: -(347.1 +/- 1.9) kJ . mol(-1), -(356.5 +/- 1.4) kJ . mol(-1), -(178.4 +/- 1.7) kJ . mol(-1), -(356.9 +/- 1.4) kJ . mol(-1) and -(377.1 +/- 2.1) kJ . mol(-1), respectively. A differential scanning calorimeter was used to determine the purities and heat capacities of the compounds studied here. Polyethene bags were used as a combustion auxiliary in the combustion experiments. (C) 2011 Elsevier Ltd. All rights reserved.