Which equivalence factor should you use to convert from 3.48 x 1018 atoms of magnesium (mg) to moles of magnesium? a (1 mol mg/1 atom mg) b (1 mol mg/3.48 x 1018 atoms mg) c (1 mol mg/6.02 x 1023 atoms mg) d (6.02 x 1023 atoms mg/1 mol mg)