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**Molecular formula:** NH₃
**Molar mass:** 17,031 g/mol
**Information:** Ammonia (azan, formerly ammonia) is a colourless, toxic gas with a pungent smell easily liquefied due to the strong hydrogen bonding between the molecules.
**The use of:** Ammonia is used for the production of nitric acid and nitrogen fertilizers. It is used as a refrigerant in industrial refrigeration systems.
**Occurrence:** It comes from the disintegration of nitrogenous organic compounds.