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Tungsten has bcc lattice. Each edge of t...

Tungsten has bcc lattice. Each edge of the unit cell is 316 pm and the density of the metal is 19.35g `cm^(-3)`. How many atoms are present in 50 g of this element?

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For bcc, Z = 2, a = 316 pm = `316xx10^(-10)` cm
d = 19.35 g/cc w = 50
Number of atoms `= (Z xx w)/(a^(3)xx d)=(2xx50)/((316xx10^(-10))^(3)xx19.35)`
`= 1.64xx10^(23)` atoms.
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