Hydrazine (N2H4) was used as the rocket fuel for the Apollo missions to the moon. It is made by the reaction of ammonia (NH3) with sodium chlorate (NaOCl) (relative atomic masses: H = 1, N = 14, O = 16, Na = 23, Cl = 35.5). ammonia sodium chlorate → hydrazine sodium chloride water 2 NH3 NaOCl → N2H4 NaCl H2O