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? startfraction 102. 0 grams upper a l subscript 2 upper o subscript 3 over 1 mole upper a l subscript 2 upper o subscript 3 endfraction. Startfraction 1 mole upper a l subscript 2 upper o subscript 3 over 102. 0 grams upper a l subscript 2 upper o subscript 3 endfraction. Startfraction 1 mole upper a l subscript 2 upper o subscript 3 over 1 gram upper a l subscript 2 upper o subscript 3 endfraction. Startfraction 102. 0 moles upper a l subscript 2 upper o subscript 3 over 102. 0 grams upper a l subscript 2 upper o subscript 3 endfraction.