Question

What is the formula for sulfur trioxide?

Answer 1

Sulfur assumes it maximum oxidation in sulfur trioxide, `SO_3`.

Explanation:

Sulfur trioxide is the acid anhydride of sulfuric acid:

`SO_3(g) + H_2O rarr H_2SO_4(aq)`

When sulfur trioxide is dissolved in sulfuric acid, oleum results:

`SO_3 + H_2SO_4 rarr H_2S_2O_7`