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Haemoglobin contains 0.33%iron by weight.the molecular mass Haemoglobin is approximately 67200amu.The no. of iron atoms present in one molecule of haemoglobin is a)6 b)2 c)3 d)4 e)5

ANS:D
Mass of Fe in 1 mole of hemoglobin
= (0.33/100)(67200)
= 221.76g

Relative Atomic Mass(RAM) of Fe= 56
56g= 1 mole of Fe
221.76g= 221.76/56
= 3.96 moles of Fe
= 4 moles of Fe(this is the no of moles of Fe in 1 mole of hemoglobin)

The ratio of the no of moles of hemoglobin to that of Fe atoms is always 1:4.
Therefore, there are 4 Fe atoms in 1 molecule of hemoglobin.


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