4NO
4NO refers to the chemical compound dinitrogen tetroxide, with the chemical formula N2O4. It is a colorless, highly toxic gas that is a dimer of nitrogen dioxide (NO2). At room temperature, dinitrogen tetroxide exists in equilibrium with nitrogen dioxide, with the ratio of the two gases depending on temperature and pressure. The reddish-brown color associated with nitrogen dioxide is absent in pure dinitrogen tetroxide.
Dinitrogen tetroxide is a powerful oxidizing agent and is used as a propellant in rockets, often in
The production of dinitrogen tetroxide typically involves the oxidation of ammonia. Environmental concerns arise from its