Molar and molecular weight of Fe2O3

• Relative molecular weight of Fe2O3: 159.6882
• Molar mass of Fe2O3: 159.6882 g/mol (0.15969 kg/mol)

Calculation of the relative molecular and molar mass of Fe2O3

• Mr[Fe2O3] = Ar[Fe] * 2 + Ar[O] * 3 = 55.845 * 2 + 15.9994 * 3 = 159.6882
• Molar mass (kg/mol) = Mr[Fe2O3] : 1000 = 159.6882 : 1000 = 0.15969 kg/mol

Fe2O3: percent composition by element

• Iron (Fe) = 111.69 : 159.6882 * 100 = 69.943 %
• Oxygen (O) = 47.9982 : 159.6882 * 100 = 30.057 %

Molar mass calculator