The pyknometric density of sodium chloride cr | vedclass

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Question

(A) The fraction of unoccupied sites (vacancies) is given by the formula: $	ext{Fraction} = \frac{ho_{	ext{X-ray}} - ho_{	ext{pyknometric}}}{

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$5.96 	imes 10^{-3}$

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(A) The fraction of unoccupied sites (vacancies) is given by the formula: $	ext{Fraction} = \frac{ho_{	ext{X-ray}} - ho_{	ext{pyknometric}}}{ho_{	ext{X-ray}}}$Given: $ho_{	ext{X-ray}} = 2.178 	imes 10^3 \ kg \ m^{-3}$ and $ho_{	ext{pyknometric}} = 2.165 	imes 10^3 \ kg \ m^{-3}$Difference $= (2.178 - 2.165) 	imes 10^3 = 0.013 	imes 10^3 \ kg \ m^{-3}$Fraction $= \frac{0.013 	imes 10^3}{2.178 	imes 10^3} = \frac{0.013}{2.178} \approx 5.96 	imes 10^{-3}$

The pyknometric density of sodium chloride crystal is $2.165 \times 10^3 \ kg \ m^{-3}$ while its $X$-ray density is $2.178 \times 10^3 \ kg \ m^{-3}$. The fraction of unoccupied sites in sodium chloride crystal is

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