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Dinitrogen trioxide



Name Dinitrogen trioxide
Chemical formula N2O3
Appearance Blue liquid
CAS number 10544-73-7


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


ΔfH0gas 91.200 kJ/mol
S0gas, 1 bar 314.626 J/mol·K


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.

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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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