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Q.

Haemoglobin contains 0.34% of iron by mass. The number of Fe atoms in 3.3gr of haemoglobin is _______ $\times 10^{19}$

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answer is 12.

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Detailed Solution

No of Fe atoms in 3.3 gr of hemoglobin
$= \frac{0.34}{100} \times \frac{3.3}{56} \times 6.02 \times 10^{23} = 1.206 \times 10^{20} = 12 \times 10^{19}$

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