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A sodium chloride crystal has a pycnometric density of 2.165 × 10³ kg m⁻³ and an X-ray density of 2.178 × 10³ kg m⁻³. What fraction of lattice sites are vacant in the crystal?
- 5.96 × 10⁻³
- 5.96 × 10⁴
- 5.96 × 10⁻²
- 5.96 × 10⁻¹
Correct answer: 5.96 × 10⁻³
Solution
The correct option is right because it accurately represents the calculated fraction of vacant lattice sites based on the difference between the pycnometric density and the X-ray density, indicating that a small percentage of the lattice sites in the sodium chloride crystal are unoccupied.
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