Molar and molecular weight of FeBr2

• Molecular formula: FeBr2 or Br2Fe
• Relative molecular weight of FeBr2: 215.653
• Molar mass of FeBr2: 215.653 g/mol (0.21565 kg/mol)

Calculation of the relative molecular and molar mass of FeBr2

• Mr[FeBr2] = Ar[Br] * 2 + Ar[Fe] = 79.904 * 2 + 55.845 = 215.653
• Molar mass (kg/mol) = Mr[FeBr2] : 1000 = 215.653 : 1000 = 0.21565 kg/mol

FeBr2: percent composition by element

• Bromine (Br) = 159.808 : 215.653 * 100 = 74.104 %
• Iron (Fe) = 55.845 : 215.653 * 100 = 25.896 %

Molar mass calculator