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Sodium (atomic mass = 23g*mol^(-1)) crys...

Sodium (atomic mass = `23g*mol^(-1)`) crystallises in body-centred cubic lattice. How many unit cell does 9.2 g of sodium metal contain ?

Text Solution

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Number of Na atoms in 9.2 g of Na metal
`=(9.2)/(23)xx6.022xx10^(23)=2.4092xx10^(23)`
Number of particles per unit cell of a bcc lattice = 2
So, number of unit cell in 9.2 g of Na metal
`=(2.4092xx10^(23))/2=1.2046xx10^(23)`
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