The number of polypeptide chains present in a molecule of haemoglobin is/are

Number of polypeptide chains present in a molecule of antibody :

The number of alpha polypeptides present in the haemoglobin

The number of alpha polypeptides present in the haemoglobin

Haemoglobin contains 0.25% iron by weight of haemoglobin is 89600. Find the number of iron atoms present in one molecule of haemoglobin.