Question

Find δerxn for the combustion of naphthalene. the heat capacity of the calorimeter, determined in separate experiment, is 5.11kj/∘
c.

Answer 1

Combustion of naphthalene in the calorimetric bomb occurs at constant volume. Thus, change of system’s internal energy during the reaction will be equal to the amount of produced heat:
ΔrU = Q = CV·ΔT = 5.11·(32.33 – 24.25) = 41.3 kJ