The pycnometric density of sodium chloride crystal is 2.165 × 103 kg m-3 while its X-rays density are 2.178 × 103 kg m-3. The fraction of unoccupied sites in sodium chloride crystal is

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5.96×10−1

5.96

5.96 × 10-2

5.96 × 10-3

answer is D.

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Detailed Solution

Difference =2.178×103−2.165×103=0.013×103 Fraction unoccupied =0.013×1032.178×103=5.96×10−3

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