Octane

Octane

Names
IUPAC name Octane
Identifiers
CAS Number	111-65-9 Y
3D model (JSmol)	Interactive image
3DMet	B00281
Beilstein Reference	1696875
ChEBI	CHEBI:17590 N
ChEMBL	ChEMBL134886 Y
ChemSpider	349 Y
DrugBank	DB02440 N
ECHA InfoCard	100.003.539
EC Number	203-892-1
Gmelin Reference	82412
KEGG	C01387 Y
MeSH	octane
PubChem CID	356
RTECS number	RG8400000
UN number	1262
CompTox Dashboard (EPA)	DTXSID0026882
SMILES CCCCCCCC
Properties
Chemical formula	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
Solubility in water	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
Magnetic susceptibility (χ)	-96.63·10−6 cm3/mol
Refractive index (nD)	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	3 1 0
Explosive limits	0.96–6.5%
U.S. Permissible exposure limit (PEL)	TWA 500 ppm (2350 mg/m3)
Related compounds
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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

Octane is an organic compound with the chemical formula C
₈H
₁₈. 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.