Hexadecane

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"Cetane" redirects here. For the diesel fuel analysis, see cetane number.
Hexadecane
Skeletal formula of hexadecane
Ball and stick model of hexadecane
Hexadecane 3d.gif
Identifiers
CAS number 544-76-3 YesY
PubChem 11006
ChemSpider 10540 YesY
EC number 208-878-9
MeSH n-hexadecane
ChEBI CHEBI:45296 YesY
ChEMBL CHEMBL134994 YesY
Beilstein Reference 1736592
Gmelin Reference 103739
Jmol-3D images Image 1
Properties
Molecular formula C16H34
Molar mass 226.44 g mol−1
Appearance Colourless liquid
Odor Gasoline-like to odorless
Density 0.77 g/cm3[2]
Melting point 18 °C (64 °F; 291 K)[2]
Boiling point 287 °C (549 °F; 560 K)[2]
log P 8.859
Vapor pressure < 0.1 mbar (20 °C)
kH 43 nmol Pa−1 kg−1
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 The exclamation-mark pictogram in the Globally Harmonized System of Classification and Labelling of Chemicals (GHS)
GHS signal word WARNING
GHS hazard statements H315
EU classification Irritant Xi
R-phrases R38
Flash point 135 °C (275 °F; 408 K)[2]
Autoignition temperature 215 °C (419 °F; 488 K)[2]
Related compounds
Related alkanes
Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
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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.[3]

See also[edit]

References[edit]

  1. ^ PubChem 11006
  2. ^ a b c d e Record in the GESTIS Substance Database from the IFA
  3. ^ Petroleum and Coal, Purdue University

External links[edit]