Chemistry - Thermochemistry Question with Solution | TestHub

The standard enthalpy of formation of octane$\left({\mathrm{C}}_8{\mathrm{H}}_{18}\right)$is$-250{\text{kJmol}}^{-1}$. The enthalpy of formation of$\mathrm{C}{\mathrm{O}}_2\left(\mathrm{g}\right)$and${\mathrm{H}}_2\mathrm{O}\left(\mathrm{l}\right)$are$-394{\text{kJmol}}^{-1}$and$-286{\text{kJmol}}^{-1}$respectively. The enthalpy of combustion of${\mathrm{C}}_8{\mathrm{H}}_{18}\left(\mathrm{g}\right)$is