What is the chemical formula for ammonia?

Ammonia is a compound that consists of one nitrogen atom and three hydrogen atoms. The simple and widely recognized chemical formula for ammonia is NH3. In this formula, the 'N' represents nitrogen, while 'H3' indicates that three hydrogen atoms are bonded to the nitrogen atom.

This structure reflects the basic molecular composition of ammonia, which is a colorless gas with a characteristic pungent smell and is widely used in fertilizers and various chemical processes. The other options represent different compounds: NH4OH is ammonium hydroxide, N2H4 is hydrazine, and NH2Cl is chloramine, each with distinct properties and structural compositions that are not equivalent to ammonia. Thus, NH3 correctly conveys the molecular identity of ammonia as it is commonly understood in chemistry.