JEE CHEMISTRY MCQ: SOME BASIC CONCEPTS OF CHEMISTRY

The following sequence of reaction occurs in commercial production of aqueous nitric acid.

$\begin{array}{cc} 4 \mathrm{NH}_3(\mathrm{~g})+5 \mathrm{O}_2(\mathrm{~g}) \longrightarrow 4 \mathrm{NO}(\mathrm{g})+6 \mathrm{H}_2 \mathrm{O}(\mathrm{l}) & \Delta \mathrm{H}=-904 \mathrm{~kJ}.........(i) \\ 2 \mathrm{NO}(\mathrm{g})+\mathrm{O}_2(\mathrm{~g}) \longrightarrow 2 \mathrm{NO}_2(\mathrm{~g}) & \Delta \mathrm{H}=-112 \mathrm{~kJ}.........(ii) \\ 3 \mathrm{NO}_2(\mathrm{~g})+\mathrm{H}_2 \mathrm{O}(\mathrm{l}) \longrightarrow 2 \mathrm{HNO}_3(\mathrm{aq})+\mathrm{NO}(\mathrm{g}) & \Delta \mathrm{H}=-140 \mathrm{~kJ}.........(iii) \end{array}$

Determine the total heat (in $\mathrm{kJ} / \mathrm{mole}$ ) liberated at constant pressure for the production of exactly 1 mole of aqueous nitric acid by this process.