Given,
One mole of haemoglobin contains 4 moles of Fe atoms.
Weight of Fe in one mole of haemoglobin = 4×56 g =224 g, which is 0.35% of the molecular weight of the protein.
Therefore, the molar weight of Haemoglobin is:
=224 g/mol0.0035
=64×103 g/mol=64 kg/mol