Molar and molecular weight of FeBr3

• Molecular formula: FeBr3 or Br3Fe
• Relative molecular weight of FeBr3: 295.557
• Molar mass of FeBr3: 295.557 g/mol (0.29556 kg/mol)

Calculation of the relative molecular and molar mass of FeBr3

• Mr[FeBr3] = Ar[Br] * 3 + Ar[Fe] = 79.904 * 3 + 55.845 = 295.557
• Molar mass (kg/mol) = Mr[FeBr3] : 1000 = 295.557 : 1000 = 0.29556 kg/mol

FeBr3: percent composition by element

• Bromine (Br) = 239.712 : 295.557 * 100 = 81.105 %
• Iron (Fe) = 55.845 : 295.557 * 100 = 18.895 %

Molar mass calculator