An element with molar mass 27 g ` mol^(-1)` forms a cubic unit cell with edge length ` 4.05 xx 10^(-8)` cm. If its density is ` 2.7 " g cm^(-3) ` , what is the nature of the cubic unit cell ?

An element with molar mass 27 g ` mol^(-1)` forms a cubic unit cell wi

1.	An element with molar mass 27 g ` mol^(-1)` forms a cubic unit cell with edge length ` 4.05 xx 10^(-8)` cm. If its density is ` 2.7 " g cm^(-3) ` , what is the nature of the cubic unit cell ?
Answer» Correct Answer - BCC `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.

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An element with molar mass 27 g ` mol^(-1)` forms a cubic unit cell with edge length ` 4.05 xx 10^(-8)` cm. If its density is ` 2.7 " g cm^(-3) ` , what is the nature of the cubic unit cell ?

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