The molar mass of aluminum oxide (al2o3) is 102.0 g/mol. what is the correct way to write the inverted molar mass of aluminum oxide as a conversion factor?

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.

1 / 102.0 g/mol