1) sodium crystallises in a body centred cubic unit cell. what is the approximate number of unit cells in 4.6g of sodium? given that the atomic mass of sodium is 23g/mol.
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Atomic mass of sodium = 23 g
This means, 23 g of sodium contains 6.023 x 10^23 atoms
Therefore, 4.6 G of sodium contain (6.023 x 10^23)(4.6)/23 = 1.20 x 10^23 atoms
Now, number of atoms in a unit cell of bcc structure = 2
Therefore,
the number of unit cells which contain
= 6 x 10^22 unit cells.
This means, 23 g of sodium contains 6.023 x 10^23 atoms
Therefore, 4.6 G of sodium contain (6.023 x 10^23)(4.6)/23 = 1.20 x 10^23 atoms
Now, number of atoms in a unit cell of bcc structure = 2
Therefore,
the number of unit cells which contain
= 6 x 10^22 unit cells.
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