Chemistry - Thermochemistry Question with Solution | TestHub

The formation enthalpies, $\Delta {\mathrm{H}}_{\mathrm{f}}\ominus$ for ${\mathrm{H}}_{(\mathrm{g})}$ and ${\mathrm{O}}_{(\mathrm{g})}$ are 220.0 and $250.0\mathrm{kJ}{\mathrm{mol}}^{-1}$, respectively, at 298.15 K , and $\Delta {\mathrm{H}}_{\mathrm{f}}{}^{\ominus }$ for ${\mathrm{H}}_2{\mathrm{O}}_{(\mathrm{g})}$ is $-242.0\mathrm{kJ}{\mathrm{mol}}^{-1}$ at the same temperature. The average bond enthalpy of the $\mathrm{O}-\mathrm{H}$ bond in water at 298.15 K is __________ $\mathrm{kJ}{\mathrm{mol}}^{-1}$ (nearest integer).