Thermodynamics

Consider the following data

Heat of combustion of \(\mathrm{H}_{2}(\mathrm{g})\quad\quad=-241.8 \mathrm{~kJ} \mathrm{~mol}^{-1}\)

Heat of combustion of \(\mathrm{C}(\mathrm{s})\quad\quad=-393.5 \mathrm{~kJ} \mathrm{~mol}^{-1}\)

Heat of combustion of \(\mathrm{C}_{2} \mathrm{H}_{5} \mathrm{OH}(\mathrm{l})\quad=-1234.7 \mathrm{~kJ}~{\mathrm{mol}}^{-1}\)

The heat of formation of \(\mathrm{C}_{2} \mathrm{H}_{5} \mathrm{OH}(\mathrm{l})\) is \((-)\) ___________ \(\mathrm{kJ} ~\mathrm{mol}^{-1}\) (Nearest integer).