Question

Haemoglobin contains 0.334% of iron by weight . The molecular weight of haemoglobin is approximately 67200. The number of iron atoms present in one molecule of haemoglobin is

(a) 4 (b) 6

(c) 3 (d) 2

Answer 1

Molecular weight of Haemoglobin = 67200 g
​Thus
1 Molecule of haemoglobin contains = (0.334/100) x67200 = 224.448 g of Iron

No . of Iron molecule = 224.448/55.845 =4.0191

Thus One molecule of haemoglobin contains approx 4 molecules of Iron