Nitrogen_tetroxide Nitrogen_tetroxide

Nitrogen tetroxide - Definition and Overview
Nitrogen tetroxide
IUPAC name
Dinitrogen tetroxide
General
Chemical formula N2O4
Molecular weight 92.011 amu
Appearance Yellow-brown liquid; vapor is reddish-brown
CAS number 10544-72-6
MSDS link N2O4_MSDS_pdf (http://www.airliquide.com/safety/msds/en/090_AL_EN.pdf)
Physical properties
Density and phase at STP  ? g/cm3 (?)
Solubility  ?
Specific gravity  ?
Crystal structure  ?
pH (10% solution with water)
(pKa) 		 ?
Acidity constant
(pKa) 		 ?
Thermal decomposition  ? K (? °C)
Phase behavior
Melting point 261.928 K (-11.2 °C)
Boiling point 310.15 K (21.1 °C)
Triple point  ? K (? °C)
 ? bar
Critical point  ? K (? °C)
 ? bar
Heat of fusion
(ΔfusH) 		 ? kJ/mol
Entropy of fusion
(ΔfusS) 		 ? J/mol·K
Heat of vaporization
(ΔvapH) 		 ? kJ/mol
Safety
Ingestion  ?
Inhalation  ?
Skin  ?
Eyes  ?
Flash point  ? °C
Autoignition temperature  ? °C
Explosive limits  ? - ?%
OSHA Permissible Exposure Limit
(PEL) 		 ? ppm
NIOSH Immediate Danger to Life and Health
(IDLH) 		 ? ppm
Precautions
  • Hazards:
    •  ?
  • Personal protection:
    •  ?
  • Reacts with:
    •  ?
  • Storage:
    •  ?
Solid properties
Standard enthalpy change of formation
(ΔfH0solid) 		 ? kJ/mol
Standard molar entropy
(S0solid) 		 ? J/mol·K
Heat capacity
(Cp) 		 ? J/mol·K
Density  ? g/cm3
Liquid properties
ΔfH0liquid  ? kJ/mol
S0liquid  ? J/mol·K
Cp  ? J/mol·K
Density  ? g/cm3
Gas properties
ΔfH0gas  ? kJ/mol
S0gas  ? J/mol·K
Cp  ? J/mol·K

Except where noted, all data was produced under conditions of standard temperature and pressure.

Nitrogen tetroxide (or Dinitrogen tetroxide) (N2O4) is a hypergolic propellant often used in combination with a hydrazine-based rocket fuel. The combination was used to fuel the Titan rockets used in the Gemini missions, and is still used today in the second stage engines of Delta II rockets.

Nitrogen dioxide is made by the catalytic oxidation of ammonia: steam is used as a diluent to reduce the combustion temperature. Most of the water is condensed out, and the gases are further cooled; the nitric oxide which was produced is oxidised to nitrogen dioxide, and the remainder of the water is removed as nitric acid. The gas is essentially pure nitrogen tetroxide, which is condensed in a brine-cooled liquefier.

Nitrogen tetroxide is a brownish yellow liquid which is easily vaporized. It is a powerful oxidizer, and is highly toxic and corrosive. However, it is not affected by mechanical shock and does not react with air. Dinitrogen tetroxide is always in equalibrium with Nitrogen_Dioxide (NO2) and some Nitrogen Dioxide will be present in any quntity of Nitrogen tetroxide, higher temperatures push the equilibrium towards Nitrogen Dioxide.


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Example Usage of tetroxide
StumbleUponQA: tetroxide: Message posted Thu Dec 17 09:32:16 PST 2009 http://su.pr/2BuBeO
dansolis: Thinks Osmium tetroxide is so sexy. After doing synthesis for a while you start saying crazy statements like this.
fauxpasfestival: Manganese tetroxide? Diborane? I don't even remember.
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