How many moles of tetrahedral voids are present in the 2 cm long iron cubic assuming cubic shape is FCC and given that the unit cell density of iron is 7.0 g cm−3? (Atomic mass of Fe is 56 amu.)
A
2
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B
4
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C
6
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D
None of the above
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Solution
The correct option is C2 Volume of cube =a3=23=8 cm3 Mass =7.0×8=56 g Number of moles of iron =5656=1 Number of moles of tetrahedral voids =2×1=2