Dinitrogen trioxide
Dinitrogen trioxide (also known as nitrous anhydride) is the inorganic compound with the formula N2O3. It is a nitrogen oxide. It forms upon mixing equal parts of nitric oxide and nitrogen dioxide and cooling the mixture below −21 °C (−6 °F):
- NO + NO2 ⇌ N2O3
| Names | |
|---|---|
| IUPAC name
N-Oxonitramide | |
Other names
| |
| Identifiers | |
3D model (JSmol) |
|
| ChEBI | |
| ChemSpider | |
| ECHA InfoCard | 100.031.013 |
| EC Number |
|
PubChem CID |
|
| UNII | |
| UN number | 2421 |
CompTox Dashboard (EPA) |
|
| |
| |
| Properties | |
| N2O3 | |
| Molar mass | 76.011 g·mol−1 |
| Appearance | Deep blue liquid |
| Density |
|
| Melting point | −100.7 °C (−149.3 °F; 172.5 K) |
| Boiling point | 3.5 °C (38.3 °F; 276.6 K) (dissociates) |
| reacts to form nitrous acid | |
| Solubility | soluble in ether |
| −16.0·10−6 cm3/mol | |
| Structure | |
| planar, Cs | |
| 2.122 D | |
| Thermochemistry | |
Heat capacity (C) |
65.3 J/(mol·K) |
Std molar entropy (S⦵298) |
314.63 J/(mol·K) |
Std enthalpy of formation (ΔfH⦵298) |
91.20 kJ/mol |
| Hazards | |
| GHS labelling: | |
| Danger | |
| H270, H280, H310, H310+H330, H314, H330 | |
| P220, P244, P260, P262, P264, P270, P271, P280, P284, P301+P330+P331, P302+P350, P303+P361+P353, P304+P340, P305+P351+P338, P310, P320, P321, P322, P361, P363, P370+P376, P403, P403+P233, P405, P410+P403, P501 | |
| NFPA 704 (fire diamond) | |
| Flash point | Non-flammable |
| Related compounds | |
Related compounds |
|
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references | |
Dinitrogen trioxide is only isolable at low temperatures, i.e. in the liquid and solid phases. In liquid and solid states, it has a deep blue color. At higher temperatures the equilibrium favors the constituent gases, with KD = 193 kPa (25 °C).
This compound is sometimes called "nitrogen trioxide", but this name properly refers to another compound, the (uncharged) nitrate radical •NO3.
This article is issued from Wikipedia. The text is licensed under Creative Commons - Attribution - Sharealike. Additional terms may apply for the media files.