Dichlorofluoromethane
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Dichlorofluoromethane or Freon 21 or R 21 is a halomethane or hydrochlorofluorocarbon with the formula CHCl2F. It is a colorless and odorless gas. It is produced by fluorination of chloroform using a catalyst such as antimony trifluoride:[4]
- CHCl3 + HF → CHCl2F + HCl
Quick Facts Names, Identifiers ...
Names | |
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Preferred IUPAC name
Dichloro(fluoro)methane | |
Other names
Dichlorofluoromethane Fluorodichloromethane Monofluorodichloromethane Dichloromonofluoromethane Freon 21 Refrigerant 21 R 21 HCFC 21 Algofrene Type 5 Arcton 7 Halon 112 UN 1029 Genetron 21 | |
Identifiers | |
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3D model (JSmol) |
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ChEMBL | |
ChemSpider |
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ECHA InfoCard | 100.000.791 |
EC Number |
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PubChem CID |
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RTECS number |
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UNII | |
UN number | 1029 |
CompTox Dashboard (EPA) |
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Properties | |
CHCl2F | |
Molar mass | 102.92 g/mol |
Appearance | Colorless gas |
Odor | Ether-like[1] |
Density |
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Melting point | −135 °C (−211 °F; 138 K) |
Boiling point | 8.92 °C (48.06 °F; 282.07 K) |
9.420 g/L at 30 °C | |
log P | 1.55 |
Vapor pressure | 160 kPa |
Henry's law constant (kH) |
0.19 (mol·kg·bar)−1 |
−48.8·10−6 cm3/mol | |
Thermal conductivity | 0.0086 W/m·K (300 K)[2] |
Hazards | |
GHS labelling: | |
Warning | |
H280, H420 | |
P410+P403, P502 | |
Flash point | Non-flammable[1] |
522 °C (972 °F; 795 K) | |
Lethal dose or concentration (LD, LC): | |
LC50 (median concentration) |
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LCLo (lowest published) |
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NIOSH (US health exposure limits): | |
PEL (Permissible) |
TWA 1000 ppm (4200 mg/m3)[1] |
REL (Recommended) |
TWA 10 ppm (40 mg/m3)[1] |
IDLH (Immediate danger) |
5000 ppm[1] |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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