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The haemoglobin from the red blood corpuscles of most mammals contains approximately 0.33% of iron by weight.The molecular weight of haemoglobin as 67,200.The numbers of iron atoms in each molecule of haemoglobin is (at wt of iron=56)

$\begin{array}{1 1}(a)\;2&(b)\;3\\(c)\;4&(d)\;5\end{array}$

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100g sample haemoglobin contains 0.33g iron
$67200g$ sample haemoglobin contains $\Rightarrow \large\frac{0.33}{100}$$\times 67200=221.8g$
$\therefore$No of iron atoms per molecule of haemoglobin $\large\frac{221.8}{56}$$=4$
Hence (c) is the correct answer.
answered Jan 9, 2014 by sreemathi.v

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