Question

work out the chemical formula for sulphur trioxide using cross method
and show working out


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Answer 1

Answer:

SO3

Explanation:

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Answer 2

Answer:

Sulfur trioxide - SO3 .

Explanation:

noticed that the compound consists of non-metals, therefore it must be a covalent compound - meaning I use prefixes for compounds.

Sulfur is S . Simple enough. Trioxide has the prefix of tri, meaning "3". Therefore there is 3 atoms of oxygen. Combine them and I get

SO3 .

Don't be confused with sulfite:

(SO3)2−

and sulfate:

(SO4)2−

Hope this helps :)