Molar and molecular weight of Fe(OH)3

• Molecular formula: Fe(OH)3 or H3FeO3
• Relative molecular weight of Fe(OH)3: 106.86702
• Molar mass of Fe(OH)3: 106.86702 g/mol (0.10687 kg/mol)

Calculation of the relative molecular and molar mass of Fe(OH)3

• Mr[Fe(OH)3] = Ar[H] * 3 + Ar[Fe] + Ar[O] * 3 = 1.00794 * 3 + 55.845 + 15.9994 * 3 = 106.86702
• Molar mass (kg/mol) = Mr[Fe(OH)3] : 1000 = 106.86702 : 1000 = 0.10687 kg/mol

Fe(OH)3: percent composition by element

• Hydrogen (H) = 3.02382 : 106.86702 * 100 = 2.83 %
• Iron (Fe) = 55.845 : 106.86702 * 100 = 52.257 %
• Oxygen (O) = 47.9982 : 106.86702 * 100 = 44.914 %

Molar mass calculator