Methane

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Methane
Identifiers
CAS number 74-82-8 YesY
PubChem 297
ChemSpider 291 YesY
EC nummer 200-812-7
UN nummer 1971
KEGG C01438 N
MeSH Methane
ChEBI CHEBI:16183 YesY
ChEMBL CHEMBL17564 YesY
RTECS nummer PA1490000
Beilstein Reference 1718732
Gmelin Reference 59
3DMet B01450
Jmol-3D images Image 1
Properties
Molecular formula CH4
Molar mass 16.04 g mol−1
Appearance Colorless gas
Odor Odorless
Density 0.6556 g L−1
Meltin pynt

-182 °C, 90.7 K, -296 °F

Boilin pynt

-164--160 °C, 109-113 K, -263--256 °F

Solubility in water 22.7 mg L−1
Solubility soluble in ethanol, diethyl ether, benzene, toluene, methanol, acetone
log P 1.09
kH 14 nmol Pa−1 kg−1
Structure
Molecular shape Tetrahedron
Dipole moment 0 D
Thermochemistry
Std enthalpy o
formation
ΔfHo298
−74.87 kJ mol−1
Std enthalpy o
combustion
ΔcHo298
−891.1–−890.3 kJ mol−1
Staundart molar
entropy
So298
186.25 J K−1 mol−1
Speceefic heat capacity, C 35.69 J K−1 mol−1
Hazards[2]
GHS pictograms The flame pictogram in the Globally Harmonized Seestem o Classification an Labelling o Chemicals (GHS)
GHS signal wird DANGER
GHS hazard statements H220
GHS precautionary statements P210
EU Index 601-001-00-4
EU classification Flammable F+
R-phrases R12
S-phrases (S2), S16, S33
NFPA 704
NFPA 704.svg
4
1
0
Flash pynt −188 °C
Autoigneetion
temperatur
537 °C
Explosive leemits 5–15%
Related compounds
Relatit alkanes
 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

Methane (/ˈmɛθn/ or /ˈmθn/) is a chemical compoond wi the chemical formula CH
4
. It is the simplest alkane an the main component o naitural gas. The relative abundance o methane maks it an attractive fuel. However, acause it is a gas at normal condeetions, methane is difficult tae transport frae its soorce.

Methane is a potent greenhouse gas, mair potent than carbon dioxide unit per unit.[3] The concentration o methane in the Yird's atmosphere in 1998, expressed as a mole fraction, wis 1745 nmol/mol (parts per billion, ppb). Bi 2008, however, global methane levels, which haed stayed maistly flat syne 1998, haed risen tae 1800 nmol/mol.[4]

References[eedit | eedit soorce]

  1. 1.0 1.1 "methane (CHEBI:16183)". Chemical Entities of Biological Interest. UK: European Bioinformatics Institute. 17 October 2009. Main. Retrieved 10 October 2011. 
  2. "Safety Datasheet, Material Name: Methane" (PDF). USA: Metheson Tri-Gas Incorporated. 4 December 2009. Retrieved 4 December 2011. 
  3. NON-CO2 GREENHOUSE GASES IN THE ATMOSPHERE, Annual Review of Energy and the Environment, Vol. 24: 645-661 (Volume publication date November 1999, DOI: 10.1146/annurev.energy.24.1.645
  4. Carbon Dioxide, Methane Rise Sharply in 2007. Noaanews.noaa.gov (2008-04-23). Retrieved on 2012-05-24.

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