Haemoglobin contains 0.33% of iron by weight. The molecular mass of haemoglobin is about 67200. the number of iron atoms (atomic mass of Fe = 56) present in a molecule of haemoglobin is:

Percentage of F e = 0. 33 %

molecular weight of haemoglobin Weight of Fe present = 0.33/100 × 67200

= 221.8 One F e weighs 55.8 g

Therefore, 221.8/55.8 = 4

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