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Haemoglobin contains 0.312% iron by weig...

Haemoglobin contains `0.312%` iron by weight. The molecular weight of haemoglobin in `89600`. Find the number of iron atoms per molecular of haemoglobin.

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The correct Answer is:
5
`because 100 g` haemoglobin has iron `= 0.312 g`
`:. 89600 g` haemoglobin has iron
`= (0.312 xx 89600)/(100) = 279.55`
`:. 1 "mole"` or `N` molecules of haemoglobin has
`= (279.55)/(56) ~~ 5g-"atom of Fe"`
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