Chemistry - Thermochemistry Question with Solution | TestHub

${\mathrm{N}}_2(\mathrm{g})+\frac{1}{2}{\mathrm{O}}_2\to {\mathrm{N}}_2\mathrm{O}(\mathrm{g})$
$\begin{array}{rl}\Delta {\mathrm{H}}_{\mathrm{f}}{}^{\mathrm{o}}=& [\text{ Energy required for breaking of bonds }]\\ & -[\text{ Energy released for forming of bonds }]\\ =& (\Delta {\mathrm{H}}_{\mathrm{N}\equiv \mathrm{N}}+\frac{1}{2}\Delta {\mathrm{H}}_{\mathrm{O}=\mathrm{O}}-\left(\Delta {\mathrm{H}}_{\mathrm{N}=\mathrm{N}}+\Delta {\mathrm{H}}_{\mathrm{N}=\mathrm{O}}\right)\\ =& \left(946+\frac{1}{2}\times 498\right)-(418+607)=170\mathrm{kJ}{\mathrm{mol}}^{-1}\\ & \text{ Resonance energy }=170-82=88\mathrm{kJ}{\mathrm{mol}}^{-1}\end{array}$