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How many unit cells are present in ...

How many unit cells are present in a cube - shaped ideal crystal of NaCl of mass 1.00 g ? [ atomic masses : Na =23,Cl-=35.5]

A

`2.57 xx 10^21` unit cells

B

`5.14 xx 10^21` unit cells

C

`1.28 xx 10^21` unit cells

D

`1.71 xx 10^21` unit cells

Text Solution

Verified by Experts

The correct Answer is:
A
a) ` 58.5g to.N.` formula units
`1g to (N)/(58.5)` formula units
b) 4 formula units `to` 1 unit cell
` (N)/(58.5) to (N)/(58.4 xx 4) = (6 xx 10^23)/(234) = 2.5 xx 10^21`
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