At 100 ^ o C, copper (Cu) has FCC unit cell structure with cell...

Crystal structure is $FCC,$ so number of atoms per unit cell \left(N\right) = 4$<br /><br />Edge length$= x . {Å}^{} = x{10}^{- 8}c{m}^{3}$<br /><br />Density$\dfrac{ZM}{{N}_{A}{a}^{3}} = \dfrac{4 \times 63 .5}{\left(6 .03 \times {10}^{23}\right){\left(x \times {10}^{- 8}\right)}^{3}}gm / {cm}^{3}$<br /><br />$= \dfrac{4 \times 63.5}{\left(6.0\right) \times {x}^{3} \times {10}^{- 1}} = \dfrac{422}{{x}^{3}}gm / c{m}^{3} = \dfrac{422}{{x}^{3}}