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  4. The haemoglobin from red blood corpuscles of most mammals contain approximately 0.33% of iron by mass. The molecular mass of haemoglobin is 67200. The number of iron atoms in each molecule of haemoglobin is

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Q. The haemoglobin from red blood corpuscles of most mammals contain approximately 0.33% of iron by mass. The molecular mass of haemoglobin is 67200. The number of iron atoms in each molecule of haemoglobin is

Some Basic Concepts of Chemistry

Solution:

$100 \,g$ haemoglobin has $=0.33\,g\,Fe$
$67200\, g$ haemoglobin has $Fe$
$=\frac{0.33}{100}\times67200=221.76\,g$ $1$ mole or $N_{A}$ molecules of haemoglobin has
$=\frac{221.76}{56}\,g$ atom of $Fe$
$= 3.96\, g$ -atom of $Fe$
$=4.0\,g$ atoms