Sulfur trioxide
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| Sulfur trioxide | |
|---|---|
| Other names | Sulfuric anhydride Sulfan® Sulphur trioxide |
| Molecular formula | SO3 |
| Molar mass | 80.06 g/mol |
| CAS number | [7446-11-9] |
| EINECS number | 231-197-3 |
| Density | 1.92 g/cm3 |
| Solubility (water) | Hydrolysis |
| Melting point | 16.9°C |
| Boiling point | 45°C |
| Thermodynamic data | |
| Standard enthalpy of formation ΔfH°gas | -397.77 kJ/mol |
| Standard molar entropy S°gas | 256.77 J.K–1.mol–1 |
| Heat capacity Cp,gas | 24.02 J.K–1.mol–1 |
| Safety data | |
| UN number | 1829 |
| RTECS number | WT4830000 |
| EU classification | Corrosive |
| R-phrases | R14, R35, R37 |
| S-phrases | S1/2, S26, S30, S45 |
| Disclaimer and references |
Sulfur trioxide (British spelling: Sulphur trioxide) has the chemical formula SO3.
Sulfur trioxide is liquid, density 1.92 g/cm3, boiling point +43.7°C, melting point +16.8°C. 3 electron pairs for VSEPR consideration
When mixed with water, it produces sulfuric acid (H2SO4):
- SO3 + H2O = H2SO4 (+ 88 kJ)
Sources
- WebElements (http://www.webelements.com/)
- Sigma-Aldrich Co. (http://www.sigmaaldrich.com)
- NIST Standard Reference Database (http://webbook.nist.gov/chemistry/)
- European Chemicals Bureau (http://ecb.jrc.it/)
See also
Template:Inorganic-compound-stubde:Schwefeltrioxid
ja:三酸化硫黄
nl:Zwaveltrioxide
pl:tlenek siarki(VI)