Methane

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Methane
Stereo, skeletal formula o methane wi some measurments addit
Ball an stick model o methane
Spacefill model o methane
Names
IUPAC name
  • Methane[1] (substitutive)
  • Tetrahydridocarbon[1] (additive)
Identifiers
3D model (JSmol)
3DMet B01450
1718732
ChEBI
ChEMBL
ChemSpider
EC Nummer 200-812-7
Gmelin Reference 59
KEGG
MeSH Methane
RTECS nummer PA1490000
UN nummer 1971
Properties
CH4
Molar mass 16.04 g·mol−1
Appearance Colorless gas
Odour Odorless
Density 0.6556 g L−1
Meltin pynt −182.5 °C; −296.4 °F; 90.7 K
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
Structur
Molecular shape Tetrahedron
0 D
Thermochemistry
Speceefic heat capacity, C 35.69 J K−1 mol−1
Staundart molar
entropy So298 		186.25 J K−1 mol−1
Std enthalpy o
formation ΔfHo298 		−74.87 kJ mol−1
Std enthalpy o
combustion ΔcHo298 		−891.1–−890.3 kJ mol−1
Hazards
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
NFPA 704
Flammability code 4: Will rapidly or completely vaporize at normal atmospheric pressur an temperatur, or is readily dispersed in air an will burn readily. Flash pynt ablo 23 °C (73 °F). E.g., propaneHealth code 1: Exposur would cause irritation but anly minor residual injury. E.g., turpentineReactivity code 0: Normally stable, even unner fire exposur condeetions, an is nae reactive wi watter. E.g., liquid nitrogenSpecial hazards (white): no codeNFPA 704 four-colored diamond
4
1
0
Flash pynt −188 °C
Explosive leemits 5–15%
Relatit compoonds
Except whaur itherwise notit, data are gien for materials in thair staundart state (at 25 °C [77 °F], 100 kPa).
YesY verify (whit is YesYN ?)
Infobox references

Methane (/ˈmɛθeɪn/ or /ˈmiːθeɪn/) 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. Houiver, 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 (pairts per billion, ppb). Bi 2008, houiver, 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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