Molar and molecular weight of FeI3

• Relative molecular weight of FeI3: 436.55841
• Molar mass of FeI3: 436.55841 g/mol (0.43656 kg/mol)

Calculation of the relative molecular and molar mass of FeI3

• Mr[FeI3] = Ar[Fe] + Ar[I] * 3 = 55.845 + 126.90447 * 3 = 436.55841
• Molar mass (kg/mol) = Mr[FeI3] : 1000 = 436.55841 : 1000 = 0.43656 kg/mol

FeI3: percent composition by element

• Iron (Fe) = 55.845 : 436.55841 * 100 = 12.792 %
• Iodine (I) = 380.71341 : 436.55841 * 100 = 87.208 %

Molar mass calculator