Question

The empirical formula for a compound with a cubic close packed arrangement of anions and with cations occupying all the octahedral sites in A_xB. The value of x is ______. (Integer answer)

Options

• 5

• 9

• 1

• 0

Answer 1

The empirical formula for a compound with a cubic close packed arrangement of anions and with cations occupying all the octahedral sites in A_xB. The value of x is 1.

Explanation:

Anions occupy ccp or fcc (B^-) = 4 B^- per unit cell

Cations occupy all octahedral voids (A⁺) = 4A' per unit cell

∴ Cell formula ⇒ A₄B₄.

Empirical formula ⇒ AB

⇒ x = 1