The haemoglobin from red corpuscles of most mammals contains approximately 0.33% of iron by weight. The molecular weight of haemoglobin is 67,200. The number of iron atoms in each molecule of haemoglobin is:
A
1
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B
2
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C
3
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D
4
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Solution
The correct option is B 4 100g sample of hemoglobin contains 0.33 g iron
67200g sample of hemoglobin contains =0.33×67200/100=221.8g
∴ number of iron atoms per molecule of hemoglobin =221.8/56=4