An element with molar mass 27 gmol^(-1)forms a cubic unit cell with edge length4.05 xx 10^(-8)cm.If its density is2.7 " g cm^(-3), what is the nature of the cubic unit cell ?

An element with molar mass 27 gmol^(-1)forms a cubic unit cell with ed

1.	An element with molar mass 27 gmol^(-1)forms a cubic unit cell with edge length4.05 xx 10^(-8)cm.If its density is2.7 " g cm^(-3), what is the nature of the cubic unit cell ?
Answer» <P> Solution :`p = ( Z xx M)/(a^(3)xx N_(A)) or Z = (pxx a^(3) xx N_(A))/M = (( 2.7 " g cm"^(-3)) (4.05xx10^(-8)"cm")^(3)(6.02xx10^(23)"mol"-1))/( 27 " g mol"^(-1))=4` HENCE , it has face -CENTRED cubic unit cell.