Molar and molecular weight of FeO

• Relative molecular weight of FeO: 71.8444
• Molar mass of FeO: 71.8444 g/mol (0.07184 kg/mol)

Calculation of the relative molecular and molar mass of FeO

• Mr[FeO] = Ar[Fe] + Ar[O] = 55.845 + 15.9994 = 71.8444
• Molar mass (kg/mol) = Mr[FeO] : 1000 = 71.8444 : 1000 = 0.07184 kg/mol

FeO: percent composition by element

• Iron (Fe) = 55.845 : 71.8444 * 100 = 77.73 %
• Oxygen (O) = 15.9994 : 71.8444 * 100 = 22.27 %

Molar mass calculator