Haemoglobin contains 0.334% of iron by weight

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Problem

Haemoglobin contains 0.334% of iron by weight. The molecular weight of haemoglobin is approximately 67200. The number of iron atoms (Atomic weight of Fe is 56) present in one molecule of haemoglobin is (1) 4 (2) 6 (3) 3 (4) 2

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