Ammonium Nitrate Molecular Formula of Ammonium Nitrate: NH4NO3 Molecular Weight: 80.04 CAS Number : 6484-52-2 EINECS : 229-347-8 Density : 1.725 Melting point : 169 Boiling point : 210 Water solubility : 190 g/100 mL (20) Number of dangerous goods transport: UN 1942/2426