What is $"sulfur trioxide"$ ?

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Answer 1 · 2016-01-22T16:52:58

Sulfur trioxide is the acid anhydride of sulfuric acid.

$SO_2(g) + 1/2O_2(g) rarr SO_3(g)$

$SO_3(g) + H_2O(l) rarr H_2SO_4(aq)$

Oleum, fuming sulfuric acid is concentrated sulfuric acid saturated (sometimes it is less concentrated) with $SO_3(g)$ .

What is "sulfur trioxide""sulfur trioxide"?