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Potassium crystallizes in a body centere...

Potassium crystallizes in a body centered cubic lattice. The approximate number of unit cells in 4.0g of potassium is X x 10^(22)` then the value of X is (Atomic mass of potassium = 39) 

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The correct Answer is:
3
BCC : Z = 2
`"2 atom .K."rarr"1 anti cell ",2xx39gm rarr 6xx10^(23),4gm rarr?`
`0.3xx10^(23)=3xx10^(22)`
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