Question

Number of unit cells in 1 g of X (atomic mass = 40) which crystallizes in simple cubic pattern is (NA = Avogadro number)

Answer 1

Considering that,

Atomic Mass (X) = 40

Then,

Total number of atoms unit cell for bcc $z$ = 2

∴ Total number of atoms in 4 g = $\frac{4g}{40g}$ × $N_A$  atoms = 0.1 ×

Thereon, number of unit cells = (0.1 × $N_A$) ÷ 2 unit cells

Ans) (0.1 × $N_A$) ÷ 2 unit cells is the required equation for the given question.