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Sodium crystallises in b.c.c unit cell. ...

Sodium crystallises in b.c.c unit cell. Calculate the approximate number of unit cells in 9.2 g of solium (Atomic mass of Na = 23u).

Text Solution

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Number of Na atoms in 9.2 grams of the metal `=(6.023xx10^(23)xx(9.2g))/((23g))=2.41xx10^(23)` atoms
Number of Na atoms per bcc unit cell = 2
`therefore` Number of unit cells present `=(2.41xx10^(23))/(2)=1.205xx10^(23)`
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