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**Molecular formula:** SO₃
**Molar mass:** 80,064 g/mol
**Information:** Sulfur trioxide occurs in several modifications. In the gaseous state it is a monomer and in the solid state it is trimeric (it contains molecules with₃O₉) or polymeric. Sulfur trioxide is highly hygroscopic (it has dehydrating effects).
** Use : ** It is used for the production of sulfuric acid.
