MCQ
Hemoglobin contains $0.34 \%$ of iron by mass. The number of $Fe$ atoms in $3.3 g$ of hemoglobin is.(Given : Atomic mass of $Fe$ is $56\,u , N _{ A }$ in $6.022$ $\left.\times 10^{23} mol ^{-1}\right)$
- A$1.21 \times 10^{5}$
- B$12.0 \times 10^{16}$
- ✓$1.21 \times 10^{20}$
- D$3.4 \times 10^{22}$