1.

The cubic unit cell of Al ( molar mass = 27 g mol^(-1)) has an edge lengthof 405 pm. Its density is 2.7 g cm^(-3). The cubic unit cell is :

Answer»

BODY centred
primitive
edge centred
face centred

Solution :`d = ( Z XX M )/( a^(3) xx N_(o))`
`d = 2.7 g CM^(-3) ,M = 27,a = 405 xx 10^(-10)cm`
`2.7 = ( Z xx 27)/( ( 405 xx 10^(-10))^(3) xx ( 6.02 xx 10^(23)))`
`:. Z = (( 405 xx 10^(-10))^(3) xx ( 6.02 xx 10^(23))xx 2.7)/( 27)=4`
`:.` Lattice is FCC lattice


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