Sulfur trioxide

   

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.

When mixed with water, it produces sulfuric acid (H2SO4):

SO3 + H2O = H2SO4     (+ 88 kJ)


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