Acetylene
C2H226.04 g/mol Calculated
Also called ethyne, narcylen, ethine and vinylene.
The gas of an oxy-acetylene torch, which burns hotter than any other common fuel gas at over 3,000 Celsius. Two carbons held by a triple bond.
Sources and notes
- The introductionfrom sourceMoleculeFinder curated
- Other namesfrom sourceWikidataIts English label and aliases on Wikidata.
- Formula and weightcomputedPubChem
- 2D drawingcomputedPubChem structure, drawn by RDKit
- 3D modelfrom sourcePubChem 3D conformerLoaded after the page has painted, and on a phone only when you ask for it; the 2D drawing shows until it arrives.
Properties and sources
Calculated by PubChem
- Molecular formula
- C2H2
- Molecular weight
- 26.04 g/mol
- XLogP3octanol/water, log units
- 0.4
- Polar surface areatopological
- 0 Ų
- H-bond donors
- 0
- H-bond acceptors
- 0
- Rotatable bonds
- 0
- Complexity
- 8
Reported Hazard label (GHS), ECHA, EU CLP Regulation, Safe Work Australia via PubChem
Danger Flammable pictogram (GHS02) and Compressed gas pictogram (GHS04); hazard statements H220, H280
Groups it belongs to
- Category
- Everyday chemistry
- Hazard classes
- Flammable, Compressed gas, GHS Danger
- Size
- Under 100 g/mol
SMILES
C#CPubChem CID 6326 · Wikidata Q133145 · InChIKey HSFWRNGVRCDJHI-UHFFFAOYSA-N · Data refreshed
Questions
- What is Acetylene?
- The gas of an oxy-acetylene torch, which burns hotter than any other common fuel gas at over 3,000 Celsius. Two carbons held by a triple bond.
- How toxic is Acetylene?
- Its GHS hazard label carries the signal word Danger and the hazard pictograms Flammable and Compressed gas. from source
- What kind of molecule is Acetylene?
- Acetylene has the formula C2H2 and a molecular weight of 26.04 g/mol. MoleculeFinder files it under alkyne, in the everyday chemistry group. from sourcefrom sourcefrom sourcefrom source
- What else is Acetylene called?
- Acetylene is also called ethyne, narcylen, ethine and vinylene. from source
Sources and notes
- Calculated valuescomputedPubChemComputed from the structure, so no laboratory conditions apply; complexity is PubChem's own structural score.
- Hazard labelfrom sourceECHA, EU CLP Regulation, Safe Work Australia via PubChemThe label combines these classifications.
- ECHAfrom sourceAttributionSource: European Chemicals Agency, echa.europa.eu.
- EU CLP Regulationfrom sourceAttributionSource: EUR-Lex, Regulation (EC) No 1272/2008, © European Union.
- Safe Work Australiafrom sourceAttributionSource: Safe Work Australia, Hazardous Chemical Information System, © Commonwealth of Australia, CC BY 4.0.
- Data refreshedfrom sourceMoleculeFinder2026-11-09