Chemistry · 2014
JEE Main · 9 April 2014, Shift 1 · Q40
The standard enthalpy of formation of NH_3 is -46.0 kJ / mol. If the enthalpy of formation of H_2 from its atoms is -436 kJ / mol and that of N_2 is…
The standard enthalpy of formation of $\displaystyle \mathrm{NH}_3$ is $\displaystyle -46.0 \mathrm{~kJ} / \mathrm{mol}$. If the enthalpy of formation of $\displaystyle \mathrm{H}_2$ from its atoms is $\displaystyle -436 \mathrm{~kJ} / \mathrm{mol}$ and that of $\displaystyle \mathrm{N}_2$ is $\displaystyle -712 \mathrm{~kJ} / \mathrm{mol}$, the average bond enthalpy of $\displaystyle \mathrm{N}-\mathrm{H}$ bond in $\displaystyle \mathrm{NH}_3$ is :
Official answer
(3)
+$\displaystyle 352$ kJ/mol
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