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Ethylene oxide



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Template:Chembox Explosive
Ethylene oxide
Ethylene oxide.svg
Ethylene-oxide-from-xtal-3D-balls.png
Other names Ethylene oxide
Dimethylene oxide
1,2-Epoxyethane
[3]-crown-1
Epoxide
Identifiers
Abbreviations EO, EtO
CAS number 75-21-8
PubChem 6354
EC number 200-849-9
KEGG D03474
MeSH Ethylene+Oxide
ChEBI CHEBI:27561
RTECS number KX2450000
SMILES C1CO1
Properties
Molecular formula C2H4O
Molar mass 44.052 g·mol−1[1]
Appearance Colorless gas
Odor Ether-like
Density 0.8821 g·cm−3[1]
Melting point

−112.46 °C, 161 K, -170 °F

Boiling point

10.4 °C, 284 K, 51 °F

Solubility in water Miscible
Vapor pressure 1.46 atm (20 °C)[2]
−30.5·10−6 cm3/mol[3]
Refractive index (nD) 1.3597 (589 nm)[1]
Dipole moment 1.94 D
Thermochemistry
Std enthalpy of
formation
ΔfHo298
−52.6 kJ·mol−1[4]
Standard molar
entropy
So298
242.5 J·mol−1·K−1[4]
Specific heat capacity, C 47.9 J·mol−1·K−1[4]
Hazards
EU classification Flammable F+ Toxic T
Carc. Cat. 1
Main hazards Carcinogen
Extremely flammable
NFPA 704

NFPA 704.svg

4
3
3
 
R-phrases Template:R45, Template:R46, R12, R23, R36/37/38
S-phrases S53, S45
Explosive limits 3 to 100%
U.S. Permissible
exposure limit (PEL)
TWA 1 ppm 5 ppm [15-minute excursion][2]
Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)

Ethylene oxide, called oxirane by IUPAC, is an organic compound with the chemical formula C2H4O.[5]

References

  1. 1.0 1.1 1.2 Haynes, p. 3.430
  2. 2.0 2.1 "NIOSH Pocket Guide to Chemical Hazards #0275". National Institute for Occupational Safety and Health (NIOSH). https://www.cdc.gov/niosh/npg/npgd0275.html. 
  3. Haynes, p. 3.576
  4. 4.0 4.1 4.2 Haynes, p. 5.22
  5. Rebsdat, Siegfried and Mayer, Dieter (2005) "Ethylene Oxide" in Ullmann's Encyclopedia of Industrial Chemistry. Wiley-VCH, Weinheim. doi:10.1002/14356007.a10_117.