Molar and molecular weight of Fe2B

• Molecular formula: Fe2B or BFe2
• Relative molecular weight of Fe2B: 122.501
• Molar mass of Fe2B: 122.501 g/mol (0.1225 kg/mol)

Calculation of the relative molecular and molar mass of Fe2B

• Mr[Fe2B] = Ar[B] + Ar[Fe] * 2 = 10.811 + 55.845 * 2 = 122.501
• Molar mass (kg/mol) = Mr[Fe2B] : 1000 = 122.501 : 1000 = 0.1225 kg/mol

Fe2B: percent composition by element

• Boron (B) = 10.811 : 122.501 * 100 = 8.825 %
• Iron (Fe) = 111.69 : 122.501 * 100 = 91.175 %

Molar mass calculator