Question

The number of atoms in 100g of the fcc crystal with density = 10 g/cm³, and the cell edge equal to 200 pm is equal to:

(a) 5 × 10²⁴
(b) 5 × 10²⁵
(c) 6 × 10²³
(d) 2 × 10²⁵

Answer 1

Correct option is (a) 5 × 10²⁴

Thus 12g of the atom contain = 6.023 × 10²³ atom.

∴ 100g of the atom will contain