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Q.

Haemoglobin contains 0.25% iron by mass. The molar mass of haemoglobin is 89600. 
Number of iron atoms present in one mole of haemoglobin are. . . . .

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Detailed Solution

Percentage of iron=0.25%

100gm of haemoglobin has 0.25gm of iron.

89600 have 89600×1000.25​=224 gm

The atomic weight of Fe =56

No. of moles present =224/56​=4

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