The enthalpy of combustion of propane, graphite and dihydrogen at 298 K are: $-2220.0 \mathrm{~kJ} \mathrm{~mol}^{-1},-393.5 \mathrm{~kJ}$ mol-1 and $-285.8 \mathrm{~kJ} \mathrm{~mol}^{-1}$ respectively. The magnitude enthalpy of formation of propane $\left(\mathrm{C}_3 \mathrm{H}_8\right)$ is. $\_\_\_\_$ kJ $\mathrm{mol}^{-1}$. (Nearest integer)