Question

How many moles of oxygen does `0.5` mol `"CO"_2"` contain?

Answer 1

`"0.5 mol CO"_2"` contains `"1 mol O"`.

Explanation:

`"1 mol CO"_2"` contains `"2 mol O"`.

`:.` `"0.5 mol CO"_2"` contains `"1 mol O"`.

`0.5 cancel"mol CO"_2xx(2"mol O")/(1cancel"mol CO"_2)="1 mol O"`