The Solid State

The Solid State

Question

Iron has a body centred cubic unit cell with the cell dimension of 286.65 pm. The density of iron is 7.87 g cm-3. Use this information to calculate Avogadro’s number. (Atomic mass of Fe = 56.0 u)

Answer

a = 286.65 pm

= 286.65 x 10-10 cm

Density (Ï) = 7.874 g cm-3

At mass of Fe = 56.0 u

Z = 2 (For body centered cubic unit cell)

Avogadro number (N0) =?
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