A sample of benzoic acid weighting 1.567 g was burned in a calorimeter. If the initial temperature was 22 degrees Celsius,the final temperature was 31.1 degrees celsius, and the heat capacity of the calorimeter was 4.88 kJ/ degrees Celsius, what is the heat of combustion of benzoic acid?

Answer 1

q = heat released by the combustion = Qcal x delta T.
q/mass sample = heat/gram. If you want it in moles convert heat/gram to heat/mol. The usual way of report is kJ/mol.