Sulfur trioxide (SO₃), commonly known as sulfuric anhydride, is a highly reactive, colorless chemical compound consisting of one sulfur atom bonded covalently to three oxygen atoms. It is one of the most important industrial chemicals, serving as a critical intermediate in sulfuric acid manufacturing and a key reagent in organic synthesis.

Sulfur trioxide is produced industrially through the catalytic oxidation of sulfur dioxide (SO₂) in the contact process.

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