The molar mass of aluminum oxide is 102.0 g/mol =>
1 mol Al2 O3 = 102.0 g
=> 1 = 1 mol Al2O3 / 102.0 g = 1 / 102.0 g/mol
So, the conversion factor, which you can use to convert mass in grams of aluminum oxide to number of moles is 1 / 102.0 g/mol.
Answer: 1 / 102.0 g/mol
