Dinitrogen trioxide is the
chemical compound with the
formula N
2O
3. This deep blue
solid is one of the binary
nitrogen oxides. It forms upon mixing equal parts of
nitric oxide and
nitrogen dioxide and cooling the mixture below -21 °C (-6 °F):
- NO + NO2 N2O3
Dinitrogen trioxide is only isolable at low temperatures, i.e. in the liquid and solid
phases. At higher temperatures the equilibrium favors the constituent gases, with
Kdiss = 193 kPa (25 °C).