dinitrogen trioxide

**Properties**
General
Name	Dinitrogen trioxide
Chemical formula	N₂O₃
Appearance	Blue liquid
CAS number	10544-73-7
Physical
Formula weight	76.01 amu
Melting point	171 K (-102 °C)
Boiling point	276 K (3 °C)
Density	1.4 ×10³ kg/m³ (liquid)
Odor	Slightly irritating
Thermochemistry
Δ_fH⁰_gas	91.200 kJ/mol
Δ_fH⁰_liquid
S⁰_{gas, 1 bar}	314.626 J/mol·K
Safety
Ingestion	Hazardous due to decomposition to toxic gases
Inhalation	Hazardous due to decomposition to toxic gases
Skin	May burn and stain skin yellow due to decomposition to NO₂
Eyes	Will cause severe burns
More info	Hazardous Chemical Database
SI units were used where possible. Unless otherwise stated, standard conditions were used. Disclaimer and references

The chemical compound dinitrogen trioxide (chemical formula: N₂O₃) is a pale blue liquid, and is unstable above 3°C (37° F) at standard pressure. It melts at -102°C (-152°F) and boils/decomposes at 3°C (37°F). The liquid at 2°C has the density 1.4 g/cm³. Dinitrogen trioxide is produced by mixing equal parts of nitric oxide (NO) and nitrogen dioxide (NO₂), and cooling the mixture below -21°C (-6°F). The gases react, forming the blue liquid N₂O₃. Dinitrogen trioxide is only stable in the liquid and solid phases, and decomposes back to NO and NO₂ when heated above 3°C.

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