Moles are basically dependent on the molecular weight of the molecule. Hence the total weight of the molecule needed is actually its molecular weight multiplied by the number of moles required. From the data given it is easy to calculate the molecular weight of Al2O3.
Once we find the appropriate weight we can simply multiply it by 3.52. This is the number of moles that the chemist needs. This gives an answer of 359g. We can easily calculate the weight in grams of any molecule or atom using this formula. It also helps to figure out the number moles if we have only the weight and vice versa.
Option 1 is right
option 2 is wrong because you flipped your conversion factor
option 3 is wrong because it is the molar mass of Al2O3
option 4 is wrong because you did not convert
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