On increasing the pressure, in which direction will the gas-phase reaction proceed to re-establish Equilibrium, is predicted by applying Le Chatelier’s principle. Consider the reaction. N 2 (g) + 3H 2 (g) ⇋ 2NH 3 (g) Which of the following is correct, if the total pressure at which the Equilibrium is established, is increased without changing the temperature?

Question

Philoid · Accepted Answer

• According to Le Chatelier’s principle: “When the concentration of any of the participants in a reaction (reactant or products) in a reaction at Equilibrium is changed keeping the temperature constant the composition of the Equilibrium mixture changes so as to adjust (minimize) the effect of concentration changes”

For the reaction, N₂ (g) + 3H₂ (g) ⇋ 2NH₃ (g) the increase in total pressure at constant temperature, the Equilibrium concentration will be changed but this is not applicable for the Equilibrium constant K_c as it will not change with pressure or concentration as it depends on temperature and temperature is remaining constant.