Molar and molecular weight of FeCl3

• Molecular formula: FeCl3 or Cl3Fe
• Relative molecular weight of FeCl3: 162.204
• Molar mass of FeCl3: 162.204 g/mol (0.1622 kg/mol)

Calculation of the relative molecular and molar mass of FeCl3

• Mr[FeCl3] = Ar[Cl] * 3 + Ar[Fe] = 35.453 * 3 + 55.845 = 162.204
• Molar mass (kg/mol) = Mr[FeCl3] : 1000 = 162.204 : 1000 = 0.1622 kg/mol

FeCl3: percent composition by element

• Chlorine (Cl) = 106.359 : 162.204 * 100 = 65.571 %
• Iron (Fe) = 55.845 : 162.204 * 100 = 34.429 %

Molar mass calculator