Question

# The haemoglobin contains $$0.33$$% of iron by weight. Its molecular weight is $$67200$$. What is the number of iron atoms in each molecule (atomic weight of iron$$=56$$)?

A
2
B
3
C
4
D
5

Solution

## The correct option is C $$4$$Weight of iron present in $$67200g$$ of the haemoglobin $$\ =\cfrac { 0.33 }{ 100 } \times 67200=221.76g$$The atomic weight of iron $$=56$$No. of iron atoms present in one molecules of haemoglobin $$=\cfrac { 221.76 }{ 56 } =3.96\approx 4$$Chemistry

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