Oxygen difluoride
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Oxygen difluoride is a chemical compound with the formula OF2. As predicted by VSEPR theory, the molecule adopts a bent molecular geometry. It is a strong oxidizer and has attracted attention in rocketry for this reason.[5] With a boiling point of −144.75 °C, OF2 is the most volatile (isolable) triatomic compound.[6] The compound is one of many known oxygen fluorides.
Quick Facts Names, Identifiers ...
Names | |
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IUPAC name
Oxygen difluoride | |
Other names
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Identifiers | |
3D model (JSmol) |
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ChEBI | |
ChemSpider |
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ECHA InfoCard | 100.029.087 |
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 | |
OF2 | |
Molar mass | 53.9962 g/mol |
Appearance | colorless gas, pale yellow liquid when condensed |
Odor | peculiar, foul |
Density |
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Melting point | −223.8 °C (−370.8 °F; 49.3 K) |
Boiling point | −144.75 °C (−228.55 °F; 128.40 K) |
hydrolyzes[1] slowly | |
Vapor pressure | 48.9 atm (at −58.0 °C or −72.4 °F or 215.2 K[lower-alpha 1]) |
Thermochemistry | |
Heat capacity (C) |
43.3 J/mol K |
Std molar entropy (S⦵298) |
246.98 J/mol K |
Std enthalpy of formation (ΔfH⦵298) |
−24.5 kJ mol−1 |
Gibbs free energy (ΔfG⦵) |
42.5 kJ/mol |
Hazards | |
GHS labelling:[2] | |
Danger | |
H270, H280, H314, H330 | |
NFPA 704 (fire diamond) | |
Lethal dose or concentration (LD, LC): | |
LC50 (median concentration) |
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NIOSH (US health exposure limits): | |
PEL (Permissible) |
TWA 0.05 ppm (0.1 mg/m3)[4] |
REL (Recommended) |
C 0.05 ppm (0.1 mg/m3)[4] |
IDLH (Immediate danger) |
0.5 ppm[4] |
Related compounds | |
Related compounds |
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Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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