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
Jmol-3D images Image
3DMet {{{value}}}
Beilstein Reference 1718732
ChEBI CHEBI:16183 YesY
ChEMBL ChEMBL17564 YesY
ChemSpider 291 YesY
ECHA InfoCard 100.000.739
EC Nummer 200-812-7
Gmelin Reference 59
KEGG C01438 N
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
Dipole moment 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[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 clessification Flammable F+
R-phrases R12
S-phrases (S2), S16, S33
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., propane Health code 1: Exposur would cause irritation but anly minor residual injury. E.g., turpentine Reactivity code 0: Normally stable, even unner fire exposur condeetions, an is nae reactive wi watter. E.g., liquid nitrogen Special hazards (white): no codeNFPA 704 four-colored diamond
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. 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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