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.

External links

• Webelements: Compound data - dinitrogen trioxide (http://www.webelements.com/webelements/compounds/text/N/N2O3-10544737.html)
• Oxides of nitrogen - synthesis and uses (http://www.c-f-c.com/supportdocs/nitrogen_oxi.htm)
• Ivtantermo - dinitrogen trioxide table of values (http://www.chem.msu.su/rus/handbook/ivtan/79.html)

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 (http://ull.chemistry.uakron.edu/erd/chemicals/7/6847.html)
SI units were used where possible. Unless otherwise stated, standard conditions were used. Disclaimer and references </font>

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