To determine the number of ions in Al2(SO4)3 you need to recognize the Aluminum ion (Al 3+) and the Sulfate ion (SO4 2-).
For the ionic charges on elements, see youtu.be/M22YQ1hHhEY .
You can either memorize the polyatomic ions or, if you are allowed, you can look it up on a table of polyatomic ions ( youtu.be/vepxhM_bZqk).
For Aluminum sulfate there are two Al 3+ ions and one three SO4 2- ions. So there are a total of five ions for one formula unit of Al2(SO4)3.
If you were given one mole of Al2(SO4)3 you would have 2 moles of Al 3+ ions and 3 moles of SO4 2- ions.
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