Ga (atomic mass 70 u) crystallizes in a hexagonal close packed structure. The total number of voids in 0.581 g of Ga is __________ \(\times\) \(10^{21}\). (Round off to the Nearest Integer). [Given : \(\mathrm{N_A}\) = 6.023 \(\times\) \(10^{23}\)]
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Correct Answer: 15
Solution and Explanation
In a hexagonal close packed structure, for N atoms there are N octahedral voids and 2N tetrahedral voids, i.e. 3N voids in total.
Total voids = \(3\times 5.0\times 10^{21}=15\times 10^{21}\).
Answer: 15
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