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Potassium crystallizes in a body centred...

Potassium crystallizes in a body centred cubic lattice. How many unit cells are present in 2g potassium ? (At. Mass of K=39)

Text Solution

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A bcc unit cell has 2 atoms per unit cell
`therefore` Mole of potassium `= (2)/(39)`
Number of atomic of `K=(2xx6.022xx10^(23))/(39)`
Number of unit cells `= (2xx6.022xx10^(23))/(39xx2)=1.54xx10^(22)`
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