Hydrogen and nitrogen react to form ammonia (NH₃). This reaction requires high temperatures and pressures and is typically catalyzed by a metal catalyst, usually iron.

The balanced chemical equation for this reaction is:

N₂ (g) + 3H₂ (g) ⇌ 2NH₃ (g)

Here's what the equation tells us:

* N₂ (g): Nitrogen gas is a reactant.

* 3H₂ (g): Hydrogen gas is a reactant.

* 2NH₃ (g): Ammonia gas is the product.

* ⇌: This symbol indicates that the reaction is reversible, meaning that ammonia can decompose back into nitrogen and hydrogen under certain conditions.

The production of ammonia is a crucial industrial process known as the Haber-Bosch process, which is used to synthesize ammonia for fertilizers and other applications.