Molar and molecular weight of Fe2(SO4)3

• Molecular formula: Fe2(SO4)3 or Fe2O12S3
• Relative molecular weight of Fe2(SO4)3: 399.8778
• Molar mass of Fe2(SO4)3: 399.8778 g/mol (0.39988 kg/mol)

Calculation of the relative molecular and molar mass of Fe2(SO4)3

• Mr[Fe2(SO4)3] = Ar[Fe] * 2 + Ar[O] * 12 + Ar[S] * 3 = 55.845 * 2 + 15.9994 * 12 + 32.065 * 3 = 399.8778
• Molar mass (kg/mol) = Mr[Fe2(SO4)3] : 1000 = 399.8778 : 1000 = 0.39988 kg/mol

Fe2(SO4)3: percent composition by element

• Iron (Fe) = 111.69 : 399.8778 * 100 = 27.931 %
• Oxygen (O) = 191.9928 : 399.8778 * 100 = 48.013 %
• Sulfur (S) = 96.195 : 399.8778 * 100 = 24.056 %

Molar mass calculator