- Use the data from the benzoic acid trial to calculate Cbomb. (see below) - Use Cbomb and data from the sucrose trial to calculate Hrxn and Hf for sucrose. Use data from the same bomb that was used for the benzoic acid trial because Cbomb is not the same for each bomb apparatus. Hcomb of Benzoic Acid 26.73kJ/g or 3226.7kJ/mol Hcomb of wire 1400cal/g CbombT=qbomb calorimeter constant, or heat capacity of the bomb, T is the qrn+qwire=qbomb