4 g coal is burnt in a bomb calorimeter in excess of oxygen at 298 K and 1 atm pressure. The temperature of the calorimeter rises from 298 K to 300…

$\displaystyle 4$ g coal is burnt in a bomb calorimeter in excess of oxygen at $\displaystyle 298$ K and $\displaystyle 1$ atm pressure. The temperature of the calorimeter rises from $\displaystyle 298$ K to $\displaystyle 300$ K. The enthalpy change during the combustion of coal is $\displaystyle -x \mathrm{~kJ} \mathrm{~mol}^{-1}$. The value of $\displaystyle x$ is \_\_\_\_. (Nearest Integer) (Given : Heat capacity of bomb calorimeter $\displaystyle 20.0 \mathrm{~kJ} \mathrm{~K}^{-1}$. Assume coal to be pure carbon)