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NCERT Class XII Chemistry
Chapter - The Solid State
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Question : 41 of 50
Marks: +1, -0
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?
Solution:  
Number of atoms in 0.5 mol close packing =0.5×6.022×1023= 0.5 \times 6.022 \times 10^{23} =3.011×1023= 3.011 \times 10^{23}
Number of tetrahedral voids = 2 × Number of atoms in the packing =2×3.011×1023=6.022×1023= 2 \times 3.011 \times 10^{23} = 6.022 \times 10^{23}
Total number of voids =3.011×1023+6.022×1023= 3.011 \times 10^{23} + 6.022 \times 10^{23} =9.033×1023= 9.033 \times 10^{23}
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