Four grams of graphite is burnt in a bomb calorimeter of heat capacity $30 \mathrm{~kJ} \mathrm{~K}^

Question

Four grams of graphite is burnt in a bomb calorimeter of heat capacity $30 \mathrm{~kJ} \mathrm{~K}^{-1}$ in excess of oxygen at 1 atmospheric pressure. The temperature rises from 300 to 304 K . What is the enthalpy of combustion of graphite (in $\mathrm{kJ} \mathrm{mol}^{-1}$ )?\

Professor PC Thomas Classes · Answer

(c) : $q=-C_v 	imes \Delta t 	imes \frac{M}{m}=-30 	imes 4 	imes \frac{12}{4}=-360 \mathrm{~kJ} \mathrm{~mol}^{-1}$
 $ \Delta H=-360 \mathrm{~kJ} \mathrm{~mol}^{-1} $