O₂O231.9980 g·mol⁻¹
Molar mass31.998 g·mol⁻¹calc 31.998 • Atomic weights: CIAAW 2021 (conventional atomic weights)
FormulaO₂O2
Classmolecular • covalentgas
| Element | Count | Mass (g/mol) | Mass % |
|---|---|---|---|
| O | 2 | 31.998 | 100.00% |
Physical properties
- State at STP
- gas
- Density
- 0.001429 g·cm⁻³ (gas at STP)
- Melting point
- 54.36 K (1 atm)
- Boiling point
- 90.2 K (1 atm)
Structure & bonding
Paramagnetic double-bonded O2 with two unpaired electrons. Strong oxidizing agent.
Occurrence & preparation
21% of air. Industrial fractional distillation of liquid air.
Uses
- Respiration support (regulated)
- Steelmaking
Safety
Oxidizer — supports combustion.
Consult current SDS. — consult current SDS before handling.