Molar and molecular weight of FeS

• Relative molecular weight of FeS: 87.91
• Molar mass of FeS: 87.91 g/mol (0.08791 kg/mol)

Calculation of the relative molecular and molar mass of FeS

• Mr[FeS] = Ar[Fe] + Ar[S] = 55.845 + 32.065 = 87.91
• Molar mass (kg/mol) = Mr[FeS] : 1000 = 87.91 : 1000 = 0.08791 kg/mol

FeS: percent composition by element

• Iron (Fe) = 55.845 : 87.91 * 100 = 63.525 %
• Sulfur (S) = 32.065 : 87.91 * 100 = 36.475 %

Molar mass calculator