Which chemical formula represents ammonia?

Ammonia is represented by the chemical formula NH3, which indicates that each molecule of ammonia consists of one nitrogen (N) atom bonded to three hydrogen (H) atoms. This simple molecular structure is a key characteristic of ammonia, making it a fundamental compound in both organic and inorganic chemistry. It is important in various chemical processes and is widely used in agriculture as a nitrogen source for plants.

The other formulas listed represent different species: NO3- refers to the nitrate ion, which has a different arrangement of atoms and charge, NH4+ represents the ammonium ion, which has an additional hydrogen and a positive charge, and N3- is the azide ion, involving three nitrogen atoms with a charge. Each of these compounds has distinct properties and uses, which highlights the unique chemical nature of ammonia as NH3.