Question

A compound forms hexagonal close-packed structure. What is the total number of voids in 0.5 mol of it? How many of these are tetrahedral voids?

Options

• 6.022 × 10²³

• 9.033 × 10²³

• 3.011 × 10²³

• 9.022 × 10²³

Answer 1

9.033 × 10²³ 

Explanation:

No. of atoms in 0.5 mole of the compound

0.5 × No = 0.5 × 6.022 × 10²³ = 3.011 × 10²³

No. of octahedral voids = no of atom = 3.011 × 10²³

No. of tetrahedral voids = 2 × 3.011 × 10²³ = 6.022 × 10²³

Total no. of voids = (3.011 + 6.022) × 10²³ = 9.033 × 10²³.