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Copper crystallises in face-centred cubic lattice and has a density of 8.930 g mol^-3 at 293 K.

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Copper crystallises in face-centred cubic lattice and has a density of 8.930 g mol-3 at 293 K. Calculate the edge length of unit cell. [At. mass of Cu = 63.5 a.m.u, Avogadro's constant NA = 6.02 x 1023].

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Density = Mass of unit cell/Volume of unit cell 

8.93 = (4 x 63.5)/(a3 x 6.02 x 1023). 

a3 = 47.24 x 10-24 

a = 3.6 x 10-8 cm. = 360 pm. 

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