Ga (atomic mass 70u) crystallizes in a hexagonal close packed structure. The total number of voids in 0.581 g of Ga is __________ ×10²¹. (Round off to the nearest integer).
[Given: N? = 6.023 ×10²³]
Ga (atomic mass 70u) crystallizes in a hexagonal close packed structure. The total number of voids in 0.581 g of Ga is __________ ×10²¹. (Round off to the nearest integer).
[Given: N? = 6.023 ×10²³]
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1 Answer
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First, the number of unit cells in the given mass is determined. In an HCP structure, there are 6 atoms and 18 total voids (6 octahedral + 12 tetrahedral) per unit cell. Multiplying the number of unit cells by 18 gives the total number of voids. The result is14.9 x 10²¹, which is rounded.
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