Chemistry - Thermochemistry Question with Solution | TestHub

In a constant volume calorimeter, $3.5\mathrm{g}$ of a gas with molecular weight $=28$ was burnt in excess oxygen at $298.0\mathrm{K}$. The temperature of the calorimeter was found to increases from $298.0\mathrm{K}$ to $298.45\mathrm{K}$ due to the combustion process. Given, that the heat capacity of the calorimeter is $2.5$ $\mathrm{kJ}{\mathrm{K}}^{-1}$, the numerical value for the enthalpy of combustion of the gas in $\mathrm{kJ}{\mathrm{mol}}^{-1}$ is