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Potassium crystallizes in a body centere...

Potassium crystallizes in a body centered cubic lattice. What is the approximate number of unit cells in 4.0g of potassium? Atomic mass of potassium = 39.

A

`3.09 xx 10^(22)`

B

`2.09 xx 10^(21)`

C

`4.10 xx 10^(21)`

D

`3.09 xx 10^(20)`

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