The simple statement of the Le Chtelier principle leads one to expect that if the concentration of

The simple statement of the Le Châtelier principle leads one to expect that if the concentration of a reactant were increased, the reaction would proceed so as to consume the added reactant. Nevertheless, consider the gas-phase reaction, N₂ + 3H₂ ⇆ 2NH3 equilibrated with excess N₂ such that N₂’s equilibrium mole fraction is 0.55. Does adding more N₂ to the equilibrated mixture result in more NH₃? Why?