Q. 125.0( 4 Votes )

An element ‘X<

Answer :


Atomic mass of element(m)=40 gmol-1 length of unit cell(a)=400 pm=4× 10-8 cm; Z=4(Fcc).

Now density is given by the formula

Where Z is the number of an atom in the unit cell

M is the molecular mass

NA is the Avogadro number

V is the volume of the unit cell.

V=a3=(4× 10-8)3 cm =64× 10-24 cm3

Putting the values

Density, D=160/38.5=4.1 g cm-3

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