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Sulfur trioxide

From Academic Kids

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
Δfgas
-397.77 kJ/mol
Standard molar entropy
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

See also


Template:Inorganic-compound-stubde:Schwefeltrioxid ja:三酸化硫黄 nl:Zwaveltrioxide pl:tlenek siarki(VI)

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