H₂OH2O18.0150 g·mol⁻¹
Molar mass18.015 g·mol⁻¹calc 18.015 • Atomic weights: CIAAW 2021 (conventional atomic weights)
FormulaH₂OH2O
Classmolecular • covalentliquid
| Element | Count | Mass (g/mol) | Mass % |
|---|---|---|---|
| H | 2 | 2.016 | 11.19% |
| O | 1 | 15.999 | 88.81% |
Physical properties
- State at STP
- liquid
- Density
- 0.997 g·cm⁻³ (liquid at 25 °C, 1 atm)
- Melting point
- 273.15 K (1 atm)
- Boiling point
- 373.15 K (1 atm)
Structure & bonding
Bent molecule with two O-H covalent bonds and two lone pairs on oxygen. Hydrogen bonding gives high boiling point.
Occurrence & preparation
Abundant as liquid water covering ~71% of Earth.
Uses
- Solvent
- Drinking water
- Industrial coolant
Safety
Non-toxic as pure water but can cause scalds as steam.
Consult current SDS. — consult current SDS before handling.