Molar and molecular weight of FeCO3

• Molecular formula: FeCO3 or CFeO3
• Relative molecular weight of FeCO3: 115.8539
• Molar mass of FeCO3: 115.8539 g/mol (0.11585 kg/mol)

Calculation of the relative molecular and molar mass of FeCO3

• Mr[FeCO3] = Ar[C] + Ar[Fe] + Ar[O] * 3 = 12.0107 + 55.845 + 15.9994 * 3 = 115.8539
• Molar mass (kg/mol) = Mr[FeCO3] : 1000 = 115.8539 : 1000 = 0.11585 kg/mol

FeCO3: percent composition by element

• Carbon (C) = 12.0107 : 115.8539 * 100 = 10.367 %
• Iron (Fe) = 55.845 : 115.8539 * 100 = 48.203 %
• Oxygen (O) = 47.9982 : 115.8539 * 100 = 41.43 %

Molar mass calculator