. Haemoglobin contains zero point three three four of iron by weight


The molecular weight of haemoglobin is approximately 67200 . The number of iron atoms (Atomic weight of Fe is 56 ) present in one molecule of hemoglobin is

(a) 4

(b) 6

(c) 3

(d) 2

Best Answer

Correct Option is: (A)

Given that haemoglobin is 0.334% of iron by weight.

Molecular weight of hB = 67200 g/mol

Quantity of iron in one molecule =0.334/100 × 67200 = 224.45amu

No. of Fe atoms in one haemoglobin molecule = given mass of Fe /  atomic mass of fe

                                                                          = 224.45/56 = 4

Therefore, there are 4 iron atoms in 1 molecule of haemoglobin.

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