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Question -

A compound forms hexagonal close-packed structure. What is the total number of voids in 0.5 mol of it? How many of these are tetrahedral voids?



Answer -

Number of close-packed particles = 0.5 × 6.022 × 10_23 = 3.011 × 10_23

Therefore, number of octahedral voids = 3.011 × 10_23

And, number of tetrahedral voids = 2 × 3.011 × 10_23 = 6.022 ×10_23

Therefore, total number of voids = 3.011 × 10_23 + 6.022 × 10_23 = 9.033 × 10_23

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