Question

Bond energy of $N-H, H-H$ and $N \equiv N$ bonds are $q_{1}, q_{2}$ and $q_{3} . \Delta H$ of : $N _{2}+3 H _{2} \longrightarrow 2 NH _{3}$ is

• A. $q_{3}+3 q_{2}-2 q_{1}$
• B. $2 q_{1}-q_{3}-2 q_{2}$
• C. $q_{3}+3 q_{2}-6 q_{1}$
• D. $q_{1}+q_{2}-q_{3}$

Answer 1

Answer: (C)

$N _{2}+3 H _{2} \longrightarrow 2 NH _{3}$
$\Delta H = q _{3}+3 q _{2}-6 q _{1}$