The reaction between nitrogen gas N2 and hydrogen gas H2 to form ammonia gas NH3 is given by the following balanced chemical equation:N2 g + 3H2 g 2NH3 g This reaction is an example of a reversible reaction, meaning it can proceed in both the forward and reverse directions. The position of the equilibrium can be shifted by changing the concentrations of the reactants or products, as described by Le Chatelier's principle.When more ammonia gas is added to the equilibrium mixture, the concentration of NH3 increases. According to Le Chatelier's principle, the system will respond by shifting the equilibrium position to counteract this change. In this case, the equilibrium will shift to the left, favoring the reverse reaction converting NH3 back to N2 and H2 .As a result, the concentration of ammonia NH3 will decrease, while the concentrations of nitrogen N2 and hydrogen H2 will increase until a new equilibrium position is established. The overall effect of adding more ammonia gas to the mixture is a shift in the equilibrium position to the left, with increased concentrations of N2 and H2 and a decreased concentration of NH3.