The iron free compound of haemoglobin is

Fill in the blanks: Iron free compound of Hb is _______________.

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

Haemoglobin contains 0.33% of iron by weight. The molecular weight of haemoglobin is approximately 67200. The number of iron atoms. (At wt of Fe=56) present in one molecule of haemoglobin is