Question

Given the following reaction at equilibrium: $N_2\left(g\right)+3H_2\left(g\right)\rightleftharpoons 2N{H}_3\left(g\right)$. Some inert gas at constant pressure is added to the system. Which of the following is true?

• A. More $N{H}_3\left(g\right)$ is produced
• B. Less $N{H}_3\left(g\right)$ is produced
• C. No effect on equilibrium
• D. $K_p$ of the reaction is decreased

Answer 1

The correct option is B Less $N{H}_3\left(g\right)$ is produced

When an inert gas is added to the system in equilibrium at constant pressure, then the total volume will increase. Hence, the number of moles per unit volume of various reactants and products will decrease. Hence, the equilibrium will shift towards the direction in which there is increase in number of moles of gases.
For the given reaction, the equilibrium will shift towards the reactants side.