Question

Number of unit cells in 4g of X(atomic mass = 40) which crystalizes in B.C.C. pattern is (N = Avogadro Number)

• A. $0.1N$
• B. $2\times 0.1N$
• C. $\frac{0.1N}{2}$
• D. $2N$

Answer 1

The correct option is C $\frac{0.1N}{2}$

40g = N atoms
4g = 0.1 N atoms
2 atoms form 1 unit cell in B.C.C
0.1 N atoms = $\frac{0.1N}{2}$