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How many unit cells are present in a cub...

How many unit cells are present in a cube shaped ideal crystal of NaCl of mass 1.00g?(Atomic mass Na-23, Cl - 35.5)

A

`2.57xx10^(21)`

B

`5.14xx10^(21)`

C

`1.28xx10^(21)`

D

`1.71xx10^(21)`

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