Question

An element (atomic mass = 100 g/mole) having bcc structure has unit cell edge 400 pm. The density of the element is (no. of atoms in bcc(Z) = 2).

• A. 2.144 g/cm3
• B. 5.2 g/cm3
• C. 7.289 g/cm3
• D. 10.376 g/cm3

Answer 1

Answer: (B)

5.2 g/cm3

Answer 2

density = $\frac{Z \times M}{N_{A} \times a_{3}} = \frac{2 \times 100}{6 \times 10^{23} \times (400 \times 10^{- 10})^{3}}$= 5.2 g/cm