1.

The number of unit cells in 8 gm of an element X( atomic mass 40 ) which crystallizes in bcc pattern in ( N_(A)is the Avogadro number)

Answer»

`6.023xx 10^(23)`
`6.023 xx 10^(22)`
`60.23 xx 10^(23)`
`((6.023 xx 10^(23))/(8xx 40))`

Solution :In bcc UNIT cell2 atom= 1 unitcell
1 molecontains6.023 `xx 10^(23)` atoms
`0.2 ` molecontains0.2 `xx 6 .023 xx 10^(23) ` atoms
`((1 unit cell)/( 2 atom)) xx 0.2 xx 6.023 xx 10^(23) = 6.023 xx 10^(22)` unit calls


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