Dinitrogen trioxide

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</table> The chemical compounddinitrogen 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. It is the anhydride of the unstable nitrous acid (HNO2), and produces it when mixed into water. If the nitrous acid is not then used up quickly, it decomposes into nitric oxide and nitric acid. Nitrite salts are sometimes produced by adding N2O3 to solutions of bases.
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zh:三氧化二氮

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

ΔfH0gas 91.200 kJ/mol
ΔfH0liquid
S0gas, 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.

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