Number of unit cells in 240g of element X (atomic mass 40) which crystallises in bcc pattern is . What is the yN_ovalue of y ?

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answer is 3.

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Detailed Solution

$240 gX = \frac{240}{40} = 6 mol = 6 N_{o}$ atoms Number of atoms in one unit cell of bcc structure = 2Thus, number of unit cell= $\frac{6 N_{0}}{2} = 3 N_{0} Thus y = 3$

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