Question

A compound forms hcp structure. What is the number of (a) octahedral voids, (b) tetrahedral voids, (c) total voids formed in 0.2 mol of the compound?

Answer 1

Number of atoms in 0.2 mol of the compound = 0.2 × N_A = 0.2 × 6.022 × 10²³
= 1.2044 × 10²³ atoms

1. Number of octahedral voids
   = Number of atoms
   = 1.2044 × 10²³
2. Number of tetrahedral voids
   = 2 × Number of atoms
   = 2 × 1.2044 × 10²³
   = 2.4088 × 10²³
3. Total number of voids
   = 1.2044 × 10²³ + 2.4088 × 10²³
   = 3.6132 × 10²³