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I was particularly confused with this question due to the fact that the answer I got when solving the problem was not one of the available choices. Why, after finding that the number of total Al2O3 atoms is ~6.02*10^21, do we multiply that number by 3 to get the number of O atoms in the molecule? This seems illogical to me considering that the answer we get from this ends up saying that we have 1.8*10^22 oxygen atoms, which is somehow more than the number of atoms in the entire molecule. From my understanding it would make more sense to divide the total number of atoms (6.02*10^21) by the number of atoms in the molecule (5) and then multiply this number by the number of oxygen atoms in the molecule (3). This tells us that the number of atoms of oxygen present in 1g of Al2O3 is 3.612*10^21. This answer makes more sense considering that it is a fraction of the total number of molecules present (6.02*10^21). Can someone please explain why my reasoning is wrong and why DAT Bootcamp's answer is correct?