Abbreviations R41
CAS number 593-53-3 YesY, 558-21-4 (2H3YesY, 20666-44-8 (13CYesY
PubChem 11638 (2H3YesY, 450707 (11CYesY, 12336970 (13CYesY, 9833918 (17F), 450725 (18FYesY, 11638 YesY
ChemSpider 11148 (2H3) YesY, 396977 (11CYesY, 21170290 (13CYesY, 8009639 (17FYesY, 396995 (18FYesY, 11148 YesY
EC number 209-796-6
UN number UN 2454
KEGG C11147 YesY
MeSH Fluoromethane
ChEBI CHEBI:28826 YesY
Beilstein Reference 1730725
Gmelin Reference 391
Jmol-3D images Image 1
Molecular formula CH3F
Molar mass 34.03 g/mol
Appearance Colorless, odorless gas
Density 1.4397 g/L

0.557 g/cm3 (liquid) at saturation pressure at 25 °C

Melting point

131.4 K (-141.8 °C)

Boiling point

195.0 K (-78.2 °C)

Solubility in water 1.66 l/kg (2.295 g/l)
Vapor pressure 3.3 MPa
EU classification Very flammable (F+)
R-phrases R12
S-phrases S9, S16, S23, S24/25, S26, S28, S33, S36/37/39, S60
NFPA 704
NFPA 704.svg
 YesY (verify) (what is: YesY/N?)
Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)
Infobox references

Fluoromethane, also known as methyl fluoride, Freon 41, Halocarbon-41 and HFC-41, is a non-toxic, liquefiable, and flammable gas at standard temperature and pressure. It is made of carbon, hydrogen, and fluorine. The name stems from the fact that it is methane (CH4) plus fluorine, minus a hydrogen. It is used in the manufacture of semiconductor and electronic products. In the presence of an RF field fluoromethane will dissociate into fluoride ions that selectively etch silicon compound films (reactive-ion etching).

Bond energy of C-F is 552 kJ/mol and its length is 0.139 nm (typically 0.14 nm). Its molecular geometry is tetrahedral.

Its specific heat capacity is Cp = 38.171 J.mol-1.K-1 at 25 °C. Critical point of fluoromethane is at 44.9 °C (318.1 K) and 6.280 MPa.

External links

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