Haemoglobin contains 0.33% of iron by mass. The molecular mass of haemoglobin is approximately 67,200. The number of iron atom (atomic mass 56) in one molecule of haemoglobin is

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Haemoglobin contains 0.33% of iron by mass. The molecular mass of haemoglobin is approximately 67,200. The number of iron atom (atomic mass 56) in one molecule of haemoglobin is