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How many unit cell are present in a cubi...

How many unit cell are present in a cubic-shaped ideal crystal of `NaCl` of mass `1.0 g`?

A

`2.57xx10^(21)` unit cells

B

`5.14xx10^(21)` unit cells

C

`1.28xx10^(21)` unit cells

D

`1.71xx10^(21)` unit cells

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The correct Answer is:
A
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