Hemoglobin contains 0.33% of iron by weight. The molecular mass of hemoglobin is about 67200. The number of iron atoms (atomic mass of Fe = 56) present in a molecule of hemoglobin is?
Hemoglobin:
Calculation of Fe present in hemoglobin:
Percentage of Fe=0.33 % molecular weight of hemoglobin
Weight of Fe = 0.33 / 100 × 67200 = 221.8
One Fe weighs 55.8 g
Therefore, 221.8 / 55.8 = 4.
Final answer: The number of iron atoms present in a hemoglobin molecule is 4.