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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
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B
3
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C
4
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D
5
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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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