How much iron's in your blood??
Chemistry
Level
2
The molecular weight of haemoglobin is about 65,000 g/mol. Haemoglobin contains 0.35% iron (Fe) by mass. Approximately, how many iron atoms are there in a haemoglobin molecule?
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1 solution
If iron is 0.35% mass of one hemoglobin molecule, then ( 0 . 0 0 3 5 ) ( 6 5 0 0 0 g / m o l ) = 2 2 7 . 5 g / m o l . Each iron atom is 56 g/mol, which computes to 5 6 g / m o l 2 2 7 . 5 g / m o l ≈ 4 atoms.