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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)`

B

`5.14xx10^(21)`

C

`1.28xx10^(21)`

D

`1.71xx10^(21)`

Text Solution

Verified by Experts

The correct Answer is:
A
`=(N_(0)xx"mass of substance")/("Molecular mass" xxZ)`
`=((6.022xx10^(23)" mol"^(-1))xx(1.0g))/((58.5 g " mol"^(-1))xx(4))=2.57xx10^(21)`
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