Iron has a body centred cubic unit cell with the cell dimension of 286.65 pm. Density of iron is 7.87 g cm-3. Use this information to calculate Avogadro's number.

(Atomic mass of Fe = 56.0 u)

1.  6.04×1023 mol-1

2.  12.08×1024 mol-1

3.  6×1022 mol-1

4.  6×10-23 mol-1

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