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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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Concept Questions :-

Density/Formula/packing fraction/ Semiconductors

Formula : d = Z×Ma3×NA,     Z for bcc = 2

NAZ×Ma3×d = 2×56 g mol-1(286.65×10-10)3×7.87 cm-3

= 6.043×1023 mol-1

Difficulty Level:

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