CO
Compound · Oxide
Carbon monoxide
一氧化碳
Carbon monoxide (一氧化碳), formula CO, is a oxide with a molar mass of 28.01 g/mol (CAS 630-08-0). Colourless, odourless gas (very hard to detect); slightly soluble in water.
Key facts
| Molar mass | 28.01 g/mol |
|---|---|
| Category | Oxide |
| State at 25°C | Gas |
| CAS | 630-08-0 |
Structure
C≡O
Diatomic molecule with a carbon–oxygen triple bond
Physical properties
| Appearance | Colourless, odourless gas (very hard to detect) |
|---|---|
| Melting point | −205 °C |
| Boiling point | −191.5 °C |
| Density | 1.25 g/L (气体) |
| Solubility | Slightly soluble in water |
Key reactions
2CO + O₂ →(点燃) 2CO₂
Combustible, burns with a blue flame
Fe₂O₃ + 3CO →(高温) 2Fe + 3CO₂
Reductant in blast-furnace ironmaking
Main uses
- Metallurgical reductant (ironmaking)
- Syngas and chemical feedstock
- Gaseous fuel
Hazard
HighHighly toxic; binds haemoglobin causing oxygen starvation, undetectable by smell
Constituent elements
Data sources
Molar mass is computed from IUPAC (CIAAW) standard atomic weights; formula, properties and reactions can be verified on PubChem, NIST and Wikipedia. The CAS number is the substance's unique registry identifier. Educational reference only.