Cetane

Hexadecane

Names
IUPAC name Hexadecane
Identifiers
CAS Number	544-76-3 Y
3D model (JSmol)	Interactive image
Beilstein Reference	1736592
ChEBI	CHEBI:45296 Y
ChemSpider	10540 Y
ECHA InfoCard	100.008.072
EC Number	208-878-9
Gmelin Reference	103739
MeSH	n-hexadecane
PubChem CID	11006
InChI InChI=1S/C16H34/c1-3-5-7-9-11-13-15-16-14-12-10-8-6-4-2/h3-16H2,1-2H3 Y Key: DCAYPVUWAIABOU-UHFFFAOYSA-N Y
SMILES CCCCCCCCCCCCCCCC
Properties
Chemical formula	C16H34
Molar mass	226.45 g·mol−1
Appearance	Colourless liquid
Odor	Gasoline-like to odorless
Density	0.77 g/cm3
Melting point	18 °C (64 °F; 291 K)
Boiling point	287 °C (549 °F; 560 K)
log P	8.859
Vapor pressure	< 0.1 mbar (20 °C)
Henry's law constant (kH)	43 nmol Pa−1 kg−1
Magnetic susceptibility (χ)	-187.63·10−6 cm3/mol
Refractive index (nD)	1.434
Thermochemistry
Specific heat capacity (C)	499.72 J K−1 mol−1 or 2.21 J K−1 g−1
Std molar entropy (So298)	586.18 J K−1 mol−1
Std enthalpy of formation (ΔfHo298)	−458.3–−454.3 kJ mol−1
Std enthalpy of combustion (ΔcHo298)	−10.7009–−10.6973 MJ mol−1
Hazards
GHS pictograms
GHS signal word	WARNING
GHS hazard statements	H315
Flash point	135 °C (275 °F; 408 K)
Autoignition temperature	215 °C (419 °F; 488 K)
Related compounds
Related alkanes	Pentadecane Heptadecane
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Y  (what is YN ?)
Infobox references

Hexadecane (also called cetane) is an alkane hydrocarbon with the chemical formula C₁₆H₃₄. Hexadecane consists of a chain of 16 carbon atoms, with three hydrogen atoms bonded to the two end carbon atoms, and two hydrogens bonded to each of the 14 other carbon atoms.

Cetane is often used as a shorthand for cetane number, a measure of the detonation of diesel fuel. Cetane ignites very easily under compression; for this reason, it is assigned a cetane number of 100, and serves as a reference for other fuel mixtures.

It has one of the lowest octane ratings, at <−30.