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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
Appearance Colorless gas
Odor Ether-like
Density 0.8821 g·cm−3
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)
−30.5·10−6 cm3/mol
Refractive index (nD) 1.3597 (589 nm)
Dipole moment 1.94 D
Thermochemistry
Std enthalpy of
formation ΔfHo298
−52.6 kJ·mol−1
Standard molar
entropy So298
242.5 J·mol−1·K−1
Specific heat capacity, C 47.9 J·mol−1·K−1
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]
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.

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