$Fe$ crystallizes in a $bcc$ lattice. If the edge length is $286.65 \,pm$ and the density is $7.874 \,g/cm^3$, calculate the Avogadro number. $(Fe = 55.845 \,u)$
- A$6.022 \times 10^{23} \,mol^{-1}$
- B$6.045 \times 10^{23} \,mol^{-1}$
- C$5.980 \times 10^{23} \,mol^{-1}$
- D$6.120 \times 10^{23} \,mol^{-1}$
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