Question: how many moles of oxygen are in one mole of aluminum carbonate?
Answer: Finally, to convert this to atoms of oxygen, use Avogadro's constant, which tells you that in order to have 1 mole of atoms of oxygen, you need to have 6.022⋅1023 atoms of oxygen. The answer is rounded to three sig figs, the number of sig figs you have for the mass of aluminium carbonate.