Question

What would happen, in terms of bond strength, to the bonds on the nitrogen atoms in a sample of pure ammonia gas when pressure is decreased causing the decomposition of ammonia in a closed system according to the balanced equation below?
$2N{H}_3\to N_2+3H_2$

• A. The bond strength would increase due to the formation of a triple bond on the nitrogen.
• B. The bond strength would decrease due to the decrease in pressure of the system.
• C. The bond strength would remain unchanged because the nitrogen bonds would be the same in either form.
• D. Pressure changes would not decompose ammonia, so no change in the system is seen.

Answer 1

The correct option is A The bond strength would increase due to the formation of a triple bond on the nitrogen.

In ammonia only single bond is present but in nitrogen triple bond is present which is stronger then single bond .Thus the formation of nitrogen by dissocation of ammonia, the bond strength increases.