Ethylene
Ethylene
General
Molecular
formula
C2H4
IUPAC Name
Ethene
SMILES
C=C
InChI
1/C2H4/c1-2/h1-2H2
Molar mass
28.05 g/mol
Appearance
colorless gas
CAS number
[74-85-1]
Properties
Density and
phase
1.178 kg/m³ at 15 °C, gas
[1]
Solubility in
water
3.5 mg/100 ml (17 °C)
Melting point
−169.2 °C (104.0 K,
-272.6 °F)
Boiling point
−103.7 °C (169.5 K,
-154.7 °F)
pKa
44
Critical point
282.4 K (9.2 °C)
at 5.04 MPa (50 atm)
Std enthalpy of
formation
ΔfH°gas
+52.47 kJ/mol
Standard molar
entropy S°gas
219.32 J·K−1·mol−1
Structure
Symmetry
group
D2h
Dipole moment
Zero
Hazards
MSDS
External MSDS
EU
classification
Extremely flammable
(F+)
NFPA 704
4
1
2
Supplementary data page
Structure and
properties
Thermodynamic
data
Spectral data
UV, IR, NMR, MS
Related compounds
Related
compounds
Ethane
Acetylene
Except where noted otherwise, data are given for
materials in their standard state (at 25 °C, 100 kPa)
Infobox disclaimer and references
Ethylene
(IUPAC name: ethene)
is
the
chemical compound with the formula C2H4.
It is the simplest alkene. Because it contains
a carbon-carbon double bond, ethylene is
called an unsaturated hydrocarbon or an ol-
efin. It is extremely important in industry and
also has a role in biology as a hormone.[2]
Ethylene is the most produced organic com-
pound in the world; global production of
ethylene exceeded 107 million metric tonnes
in 2005.[3] To meet the ever increasing de-
mand for ethylene, sharp increases in pro-
duction facilities have been added globally,
particularly in the Gulf countries.
Structure
This hydrocarbon has four hydrogen atoms
bound to a pair of carbon atoms that are
From Wikipedia, the free encyclopedia
Ethylene
1
connected by a double bond. All six atoms
that comprise ethylene are coplanar. The H-
C-H angle is 119°, close to the 120° for ideal
sp² hybridized carbon. The molecule is also
relatively rigid: rotation about the C-C bond
is a high energy process that requires break-
ing the π-bond, while retaining the σ-bond
between the carbon atoms.
The double bond is a region of