Carbon monoxide
CO28.01 g/mol Calculated
Also called Carboneum oxygenisatum, CO, carbon oxide and carbonyl ligand.
The colourless, odourless gas from incomplete burning that a detector in the hall is listening for. The body also makes tiny amounts of it as a signal.
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.
Where you encounter it
Carbon monoxide on our curated lists.
Household
Sources and notes
- Our curated lists and their amountsfrom sourceMoleculeFinder curatedEach amount is an editorial figure from our food and drink lists, not a measurement of any one product.
- How it gets therefrom sourceMoleculeFinder curatedEach mark is set by hand on our lists, never inferred; a label's ingredient is added by the maker. A row with no mark data says Not marked.
- Fuel and flame: no markfrom sourceMoleculeFinder curatedFormed when a fuel burns without enough air.
Properties and sources
Calculated by PubChem
- Molecular formula
- CO
- Molecular weight
- 28.01 g/mol
- XLogP3octanol/water, log units
- 0.7
- Polar surface areatopological
- 1 Ų
- H-bond donors
- 0
- H-bond acceptors
- 1
- Rotatable bonds
- 0
- Complexity
- 10
Reported Hazard label (GHS), ECHA, EU CLP Regulation, Safe Work Australia via PubChem
Danger Flammable pictogram (GHS02), Compressed gas pictogram (GHS04), Toxic pictogram (GHS06) and Health hazard pictogram (GHS08); hazard statements H220, H221, H280, H331, H360, H372
Groups it belongs to
- Category
- Everyday chemistry
- Family
- Inorganic compounds
- Product lists
- Fuel and flame
- Hazard classes
- Flammable, Compressed gas, Acutely toxic, Health hazard, GHS Danger
- Size
- Under 100 g/mol
SMILES
[C-]#[O+]PubChem CID 281 · Wikidata Q2025 · InChIKey UGFAIRIUMAVXCW-UHFFFAOYSA-N · Data refreshed
Questions
- What is Carbon monoxide?
- The colourless, odourless gas from incomplete burning that a detector in the hall is listening for. The body also makes tiny amounts of it as a signal.
- Where is Carbon monoxide found?
- Carbon monoxide is in these product groups: fuel and flame. from source
- How toxic is Carbon monoxide?
- Its GHS hazard label carries the signal word Danger and the hazard pictograms Flammable, Compressed gas, Toxic and Health hazard. from source
- What kind of molecule is Carbon monoxide?
- Carbon monoxide has the formula CO and a molecular weight of 28.01 g/mol. MoleculeFinder files it under inorganic compounds, in the everyday chemistry group. from sourcefrom sourcefrom sourcefrom source
- What else is Carbon monoxide called?
- Carbon monoxide is also called Carboneum oxygenisatum, CO, carbon oxide and carbonyl ligand. 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