The pyknometric density of sodium chloride crystal is 2.165 x 103 kg m-3 while its X-ray density is 2.178 x 103 kg m-3. The fraction of the unoccupied sites in sodium chloride crytal is?

First density = 2.165 * 103

Difference of density = 2178-2165 = 13 kg/m3

Therefore,

fraction of unoccupied site = 13/2178 =  5.96 * 10-3

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