Molar and molecular weight of FeS2

• Relative molecular weight of FeS2: 119.975
• Molar mass of FeS2: 119.975 g/mol (0.11998 kg/mol)

Calculation of the relative molecular and molar mass of FeS2

• Mr[FeS2] = Ar[Fe] + Ar[S] * 2 = 55.845 + 32.065 * 2 = 119.975
• Molar mass (kg/mol) = Mr[FeS2] : 1000 = 119.975 : 1000 = 0.11998 kg/mol

FeS2: percent composition by element

• Iron (Fe) = 55.845 : 119.975 * 100 = 46.547 %
• Sulfur (S) = 64.13 : 119.975 * 100 = 53.453 %

Molar mass calculator