Nitrogen dioxide

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Nitrogen dioxide
Skeletal formula o nitrogen dioxide wi some meisurmentsEP
Spacefill model o nitrogen dioxide
Nitrogen dioxide at different temperaturs
Nitrogen dioxide at −196 °C, 0 °C, 23 °C, 35 °C, and 50 °C. (NO
2
) converts tae the colourless dinitrogen tetroxide (N
2
O
4
) at law temperaturs, an reverts tae NO
2
at heicher temperaturs.
Names
IUPAC name
Nitrogen dioxide
Ither names
Nitrogen(IV) oxide,[1] Deutoxide o nitrogen
Identifiers
3D model (JSmol)
ChEBI
ChemSpider
ECHA InfoCard 100.030.234
EC Nummer 233-272-6
Gmelin Reference 976
RTECS nummer QW9800000
UNII
UN nummer 1067
Properties
NO
2
Molar mass 46.0055 g mol−1
Appearance Vivid orange gas
Odour Chlorine lik
Density 1.88 g dm−3[2]
Meltin pynt −11.2 °C (11.8 °F; 261.9 K)
Bylin pynt 21.2 °C (70.2 °F; 294.3 K)
Hydrolyses
Solubility soluble in CCl
4
, nitric acid,[3] chloroform
Vapour pressur 98.80 kPa (at 20 °C)
Magnetic susceptibility +150.0·10−6 cm3/mol
Refractive index (nD) 1.449 (at 20 °C)
Structur
Pynt group C2v
Molecular shape Bent
Thermochemistry
Speceefic heat capacity, C 37.5 J/mol K
Staundart molar
entropy
So298
240 J mol−1 K−1[4]
Std enthalpy o
formation
ΔfHo298
+34 kJ mol−1[4]
Hazards
Main hazards Pushion, oxidizer
Safety data sheet ICSC 0930
GHS pictograms The flame-ower-circle pictogram in the Globally Harmonised Seestem o Clessification an Labellin o Chemicals (GHS) The gas-cylinder pictogram in the Globally Harmonised Seestem o Clessification an Labellin o Chemicals (GHS) The corrosion pictogram in the Globally Harmonized Seestem o Classification an Labelling o Chemicals (GHS) The skull-an-crossbones pictogram in the Globally Harmonized Seestem o Classification an Labellin o Chemicals (GHS) The health hazard pictogram in the Globally Harmonized Seestem o Classification an Labellin of Chemicals (GHS)
GHS signal wird Danger
GHS hazard statements H270, H314, H330
GHS precautionary statements P220, P260, P280, P284, P305+351+338, P310
NFPA 704
Lethal dose or concentration (LD, LC):
30 ppm (guinea pig, 1 or)
315 ppm (rabbit, 15 min)
68 ppm (ratton, 4 or)
138 ppm (ratton, 30 min)
1000 ppm (moose, 10 min)[6]
64 ppm (dog, 8 hr)
64 ppm (monkey, 8 hr)[6]
US heal exposur leemits (NIOSH):
PEL (Permissible)
C 5 ppm (9 mg/m3)[5]
REL (Recommendit)
ST 1 ppm (1.8 mg/m3)[5]
IDLH (Immediate danger)
20 ppm[5]
Relatit compoonds
Dinitrogen pentoxide

Dinitrogen tetroxide
Dinitrogen trioxide
Nitric oxide
Nitrous oxide

Relatit compoonds
Chlorine dioxide
Carbon dioxide
Except whaur itherwise notit, data are gien for materials in thair staundart state (at 25 °C [77 °F], 100 kPa).
YesY verify (whit is YesYN ?)
Infobox references

Nitrogen dioxide is the chemical compoond wi the formula NO
2
. It is ane o several nitrogen oxides. NO
2
is an intermediate in the industrial seenthesis o nitric acid, millions o tons o which are produced each year. At heicher temperaturs it is a reiddish-broun gas that has a chairactereestic shairp, bitin odour an is a prominent air pollutant.[7] Nitrogen dioxide is a paramagnetic, bent molecule wi C2v pynt group symmetry.

References[eedit | eedit soorce]

  1. "nitrogen dioxide (CHEBI:33101)". Chemical Entities of Biological Interest (ChEBI). UK: European Bioinformatics Institute. 13 January 2008. Main. Retrieved 4 October 2011. 
  2. Haynes, William M., ed. (2011). CRC Handbook of Chemistry and Physics (92nd ed.). CRC Press. p. 4.79. ISBN 1439855110. 
  3. Mendiara, S. N.; Sagedahl, A.; Perissinotti, L. J. (2001). "An electron paramagnetic resonance study of nitrogen dioxide dissolved in water, carbon tetrachloride and some organic compounds". Applied Magnetic Resonance. 20: 275. doi:10.1007/BF03162326. 
  4. 4.0 4.1 Zumdahl, Steven S. (2009). Chemical Principles 6th Ed. Houghton Mifflin Company. p. A22. ISBN 0-618-94690-X. 
  5. 5.0 5.1 5.2 NIOSH Pocket Guide tae Chemical Hazards 0454
  6. 6.0 6.1 "Nitrogen dioxide". Immediately Dangerous to Life and Health. National Institute for Occupational Safety and Health (NIOSH). 
  7.  This airticle incorporates public domain material frae the Unitit States Environmental Pertection Agency document: "Nitrogen dioxide". United States Environmental Protection Agency. Feb 23, 2016.