CO₂CO244.0100 g·mol⁻¹
Molar mass44.010 g·mol⁻¹calc 44.009 • Atomic weights: CIAAW 2021 (conventional atomic weights)
FormulaCO₂CO2
Classmolecular • covalentgas
| Element | Count | Mass (g/mol) | Mass % |
|---|---|---|---|
| C | 1 | 12.011 | 27.29% |
| O | 2 | 31.998 | 72.71% |
Physical properties
- State at STP
- gas
- Density
- 0.00198 g·cm⁻³ (gas at STP)
- Melting point
- 216.58 K (triple point 5.11 atm; sublimes at 1 atm, 194.7 K)
- Boiling point
- 194.7 K (sublimation, 1 atm)
Structure & bonding
Linear O=C=O with two double bonds. Acidic oxide — dissolves to give carbonic acid.
Occurrence & preparation
Atmospheric gas (~0.04%). Produced by respiration and combustion.
Uses
- Carbonated drinks
- Fire extinguishers
Safety
Asphyxiant at high concentration; solid dry ice causes frostbite.
Consult current SDS. — consult current SDS before handling.