Total number of diamond unit cells in 1.2 g of diamond sample is :
A
6.0×1021
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B
6.0×1022
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C
7.5×1021
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D
5.0×1022
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Solution
The correct option is B7.5×1021 In Diamond structure, there are carbon atoms at the FCC locations and 4 carbon atoms present in the alternate tetrahedral voids. Therefore the total number of Carbon atoms per unit cell of Diamond is 4+4=8 Moles of carbon in 1.2g of diamond = 1.212=0.1 Number of atoms of carbon in 1.2g of diamond = 0.1×6×1023=6×1022 Number of unit cells = 6×1022×18=7.5×1021