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Hemoglobin contains 0.25% (by wt) of iron. If the molecular weight of hemoglobin is 89600. Then the no. of gm-atoms of iron present in a mole of hemoglobin is_____.

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answer is 4.

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Detailed Solution

100gm haemoglobin $\to$ 0.25gm Fe
89600 gm $\to ?$ (GMW of haemoglobin=89600)
$\frac{89, 600}{100} \times \frac{1}{4} = \frac{894}{4} = 224 g m$
$∴$ No. of Fe gram-atoms $= \frac{224}{56} = 4$ gram atoms of iron

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