Octane: Chemical compound

Octane is an organic compound with the chemical formula C8H18.

It is an alkane with eight carbon atoms. It is commonly used in fuel. It is the most important part of gasoline, because it is the part that lets out most of the energy that comes from gasoline when it is burned. A high octane fuel will be better than a low octane fuel.

Octane
Names
IUPAC name
Octane
Identifiers
3D model (JSmol)
3DMet
Beilstein Reference 1696875
ChEBI
ChEMBL
ChemSpider
DrugBank
ECHA InfoCard 100.003.539
EC Number
  • 203-892-1
Gmelin Reference 82412
KEGG
MeSH octane
PubChem CID
RTECS number
  • RG8400000
UN number 1262
CompTox Dashboard (EPA)
SMILES
  • CCCCCCCC
Properties
C8H18
Molar mass 114.23 g·mol−1
Appearance Colorless liquid
Odor Gasoline-like
Density 0.703 g cm−3
Melting point −57.1 to −56.6 °C; −70.9 to −69.8 °F; 216.0 to 216.6 K
Boiling point 125.1 to 126.1 °C; 257.1 to 258.9 °F; 398.2 to 399.2 K
0.007 mg dm−3 (at 20 °C)
log P 4.783
Vapor pressure 1.47 kPa (at 20.0 °C)
kH 29 nmol Pa−1 kg−1
Conjugate acid Octonium
-96.63·10−6 cm3/mol
1.398
Viscosity 542 μPa s (at 20 °C)
Thermochemistry
Std enthalpy of
formation ΔfHo298
−252.1–−248.5 kJ mol−1
Std enthalpy of
combustion ΔcHo298
−5.53–−5.33 MJ mol−1
Standard molar
entropy So298
361.20 J K−1 mol−1
Specific heat capacity, C 255.68 J K−1 mol−1
Hazards
NFPA 704

Octane: Chemical compound

3
1
0
 
Explosive limits 0.96–6.5%
U.S. Permissible
exposure limit (PEL)
TWA 500 ppm (2350 mg/m3)
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Infobox references

References

Tags:

AlkaneAtomCarbonChemical formulaEnergyGasolineHydrogenOrganic compound

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