Ethenone
| Names | |
|---|---|
| Preferred IUPAC name
Ethenone | |
| Other names
Ketene Carbomethene Keto-ethylene | |
| Identifiers | |
3D model (JSmol) |
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| 1098282 | |
| ChEBI | |
| ChemSpider | |
| ECHA InfoCard | 100.006.671 |
| EC Number |
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PubChem CID |
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| RTECS number |
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| UNII | |
CompTox Dashboard (EPA) |
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| Properties | |
| C2H2O | |
| Molar mass | 42.037 g/mol |
| Appearance | Colourless gas |
| Odor | penetrating |
| Density | 1.93 g/cm3 |
| Melting point | −150.5 °C (−238.9 °F; 122.6 K) |
| Boiling point | −56.1 °C (−69.0 °F; 217.1 K) |
| decomposes | |
| Solubility | soluble in acetone ethanol ethyl ether aromatic solvents halocarbons |
| Vapor pressure | >1 atm (20°C) |
Refractive index (nD) |
1.4355 |
| Thermochemistry | |
Heat capacity (C) |
51.75 J/K mol |
Std enthalpy of formation (ΔfH⦵298) |
−87.24 kJ/mol |
| Hazards | |
| NFPA 704 (fire diamond) | |
| Flash point | −107 °C (−161 °F; 166 K) |
| Explosive limits | 5.5–18% |
| Lethal dose or concentration (LD, LC): | |
LD50 (median dose) |
1300 mg/kg (oral, rat) |
LC50 (median concentration) |
17 ppm (mouse, 10 min) |
LCLo (lowest published) |
23 ppm (mouse, 30 min) 53 ppm (rabbit, 2 hr) 53 ppm (guinea pig, 2 hr) 750 ppm (cat, 10 min) 200 ppm (monkey, 10 min) 50 ppm (mouse, 10 min) 1000 ppm (rabbit, 10 min) |
| NIOSH (US health exposure limits): | |
PEL (Permissible) |
TWA 0.5 ppm (0.9 mg/m3) |
REL (Recommended) |
TWA 0.5 ppm (0.9 mg/m3) ST 1.5 ppm (3 mg/m3) |
IDLH (Immediate danger) |
5 ppm |
| Safety data sheet (SDS) | External MSDS |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references | |
Ethenone is the formal name for ketene, an organic compound with formula C2H2O or H2C=C=O. It is the simplest member of the ketene class. It is an important reagent for acetylations.