If the formula used in calculating molar mass is the molecular formula, the formula weight computed is the molecular weight. The percentage by weight of any atom or group of atoms in a compound can be computed by dividing the total weight of the atom (or group of atoms) in the formula by the formula weight and multiplying by 100.
The molar mass and molecular weight of Fe Iron is 55. 845.
The molar mass of Fe is 55. 845 gmol. The only difference between an Fe atom and an Fe ion is three electrons. The electrons have so little mass compared to the rest of the atom that their masses can be ignored. So, the molar masses of Fe and of Fe are the same: 55. 845 gmol. The mass of Fe in 1 mol of compound depends on the formula
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