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

How many unit cells are present in a cube-shaped crystal of NaCl of mass 1.00g?

A

`2.57 xx 10^(21)`

B

`5.14 xx 10^(21)`

C

`1.28 xx 10^(21)`

D

`1.71 xx 10^(21)`

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