Molar and molecular weight of FeCl2

• Molecular formula: FeCl2 or Cl2Fe
• Relative molecular weight of FeCl2: 126.751
• Molar mass of FeCl2: 126.751 g/mol (0.12675 kg/mol)

Calculation of the relative molecular and molar mass of FeCl2

• Mr[FeCl2] = Ar[Cl] * 2 + Ar[Fe] = 35.453 * 2 + 55.845 = 126.751
• Molar mass (kg/mol) = Mr[FeCl2] : 1000 = 126.751 : 1000 = 0.12675 kg/mol

FeCl2: percent composition by element

• Chlorine (Cl) = 70.906 : 126.751 * 100 = 55.941 %
• Iron (Fe) = 55.845 : 126.751 * 100 = 44.059 %

Molar mass calculator