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acetylene

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acetylene

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Also known as ethyne, narcylen, acetylen, ethine, vinylene

Acetylene (systematic name: ethyne) is a chemical compound with the formula and structure . It is a hydrocarbon and the simplest alkyne. This colorless gas is widely used as a fuel and a chemical building block. It is unstable in its pure form and thus is usually handled as a solution. Pure acetylene is odorless, but commercial grades usually have a marked odor due to impurities such as divinyl sulfide and phosphine.

OverviewAI-generated

Acetylene is a chemical compound with the formula C₂H₂ and a molecular mass of 26.016. It has a melting point of -80.75 and sublimation temperatures of -83.9 and -84.72. The substance possesses a density of 1.0896 and a vapor pressure of 44.2. Its pKa is 25, and it has an ionization energy of 11.4. The electric dipole moment is 0, while the standard enthalpy of formation is -227.4 and the combustion enthalpy is 1302.

Safety data indicates a lower flammable limit of 2.5 and an upper flammable limit of 100. The autoignition temperature is 305, and the ceiling exposure limit is 2662. The minimal lethal concentration is 900000, with a median lethal concentration (LC50) of 850000. Acetylene has a solubility of 2. In computational chemistry, it is represented by the SMILES string C#C and has an xlogp of 0.4.

Synthesized by Vinony from 35 facts across 4 sources: Wikidata, PubChem, PubMed, Vinony graph. Generated from structured data (not the Wikipedia text) and checked against those facts — may still contain errors.

Chemical data

Formula
C2H2
Molecular weight
26.04 g/mol
IUPAC name
acetylene
SMILES
C#C
InChIKey
HSFWRNGVRCDJHI-UHFFFAOYSA-N
XLogP
0.4
Polar surface area
0 Ų
H-bond donors
0
H-bond acceptors
0
Formal charge
0

via PubChem

Research

43,218 papers

via PubMed

Wikidata facts

Mass
26.016
Autonomy
305
Has use
fuel
Show 22 more facts
described by source
Granat Encyclopedic Dictionary
Commons category
Acetylene
canonical SMILES
C#C
chemical formula
C₂H₂
pKa
25
NIOSH Pocket Guide ID
0008
sublimation temperature
-84.72
density
1.0896
vapor pressure
44.2
solubility
2
lower flammable limit
2.5
upper flammable limit
100
ionization energy
11.4
ceiling exposure limit
2662
standard enthalpy of formation
-227.4
combustion enthalpy
1302
melting point
-80.75
different from
ethane
subject has role
reducing agent
electric dipole moment
0
minimal lethal concentration
900000
median lethal concentration (LC50)
850000
Sources (8)

via Wikidata · CC0

~16 min read

Encyclopedic overview

23 sections
Contents
  • Discovery
  • Preparation
  • Partial combustion of hydrocarbons
  • Dehydrogenation of alkanes
  • Carbochemical method
  • Bonding
  • Physical properties
  • Changes of state
  • Other
  • Applications
  • Welding
  • Chemicals
  • Historical uses
  • Niche applications
  • Natural occurrence
  • Reactions
  • Vinylation reactions
  • Organometallic chemistry
  • Acid–base reactions
  • Hydrogenation
  • Safety and handling
  • References
  • External links

Acetylene (systematic name: ethyne) is a chemical compound with the formula and structure . It is a hydrocarbon and the simplest alkyne. This colorless gas is widely used as a fuel and a chemical building block. It is unstable in its pure form and thus is usually handled as a solution. Pure acetylene is odorless, but commercial grades usually have a marked odor due to impurities such as divinyl sulfide and phosphine.

As an alkyne, acetylene is unsaturated because its two carbon atoms are bonded together in a triple bond. The carbon–carbon triple bond places all four atoms in the same straight line, with CCH bond angles of 180°. The triple bond in acetylene results in a high energy content that is released when acetylene is burned.

Excerpted from Wikipedia’s “acetylene” article, available under the CC BY-SA 4.0 licence.

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