Question

In the reaction $N_2+3H_2\iff 2N{H}_3+21.8Kcal$, the increase in pressure will result in:

• A. an increase in the rate of forward reaction
• B. an increase in the rate of backward reaction
• C. no change in the reaction
• D. an increase in the volume

Answer 1

Answer: (A)

an increase in the rate of forward reaction

In the reaction $N_2\left(g\right)+3H_2\left(g\right)\iff 2N{H}_3\left(g\right)$, the number of moles decreases in the forward reaction from 4 to 2 . Also the number of moles increases in the reverse reaction form 2 to 4.

When the pressure is increased, the forward reaction will be favoured as the forward reaction occurs with decrease in the number of moles.

Thus, the position of the equilibrium will shift towards the products.

Thus, when pressure is increased the rate of the forward reaction is increased.

Option A is correct.