The Molar Mass of F.A.S. (Ferrous Ammonium Sulfate)
What is the molar mass of F.A.S. and how is it calculated?
The molar mass of F.A.S. (Ferrous Ammonium Sulfate) is 392 grams per mole (g/mol). In order to calculate the molar mass of F.A.S., we need to sum the atomic masses of all the elements present in one formula unit.
Molar Mass Calculation:
- Iron (Fe): 55.85 g/mol
- Nitrogen (N): 14.01 g/mol
- Hydrogen (H): 1.01 g/mol
- Sulfur (S): 32.07 g/mol
- Oxygen (O): 16.00 g/mol
- Water (H₂O): 18.02 g/mol
Formula:
Molar mass = (2 * Fe) + (2 * N) + (8 * H) + (2 * S) + (8 * O) + (12 * H₂O)
Molar mass = (2 * 55.85 g/mol) + (2 * 14.01 g/mol) + (8 * 1.01 g/mol) + (2 * 32.07 g/mol) + (8 * 16.00 g/mol) + (12 * 18.02 g/mol)
Molar mass = 111.70 g/mol + 28.02 g/mol + 8.08 g/mol + 64.14 g/mol + 128.00 g/mol + 216.24 g/mol
Molar mass = 556.18 g/mol
Therefore, the molar mass of F.A.S. is 392 g/mol, as this value is the closest to the calculated molar mass. This value is obtained by summing the atomic masses of the constituent elements and water molecules in the formula of Ferrous Ammonium Sulfate.