It looks like you're referring to a chemical reaction involving nitrogen gas (N₂), magnesium (Mg), ammonium chloride (NH₄Cl), and ammonia (NH₃). However, the expression you've given isn't entirely clear in terms of what you're asking or how it is formatted.
If you're looking to understand the reaction steps, here’s a possible interpretation of the process:
Synthesis of Ammonia from Nitrogen and Magnesium: The reaction of nitrogen gas with magnesium can produce magnesium nitride (Mg₃N₂). This might be implied in your equation, though the full equation isn't written out.
\[ N_2 + 3Mg \rightarrow Mg_3N_2 \]
Formation of Ammonium Chloride: Ammonium chloride can be produced from ammonia and hydrochloric acid:
\[ NH_3 + HCl \rightarrow NH_4Cl \]
Decomposition of Ammonium Chloride: Ammonium chloride can decompose upon heating into ammonia and hydrogen chloride:
\[ NH_4Cl \rightarrow NH_3 + HCl \]
If you have a specific question about the reaction, such as balancing it, calculating yields, or understanding the significance of these reactants and products, please provide more details!