Q. 225.0( 1 Vote )

An element X (mol

Answer :


• Molar mass= 60 g mol-1

• Density = 6.23 g cm-3

• edge length of the unit cell is 4× 10-8 cm.


Mass of the atom in the unit cell,

Then, density of the unit cell =



where z is the no. of atoms present in the unit cell, M is the molar mass of the element, a is the edge length of the cube and NA is the Avogadro number.

= 4

Since, there are 4 atoms present in the unit cell it is a fcc or ccp lattice.

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