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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

`5.14xx10^(21)`

B

`1.28xx10^(21)`

C

`1.71xx10^(21)`

D

`2.57xx10^(21)`

Text Solution

Verified by Experts

The correct Answer is:
D
One unit cell has 4 NaCl units.
Mass of unit cell `=(4xx58.5)/(6.023xx10^(23))g`
Number of unit cell `=(6.023xx10^(23))/(4xx 58.5)=2.57xx10^(21)`
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