Chemistry - Solid State Question with Solution | TestHub

Packing efficiency $=68\%$ BCC unit cell $$\begin{array}{rl}& \mathrm{Z}=2,\mathrm{a}=3.3\mathring{A}\\ & =3.3\times 10^{-8}\mathrm{cm}\\ & \mathrm{d}=8.57\mathrm{g}/{\mathrm{cm}}^3\\ & \mathrm{d}=\frac{\mathrm{Z}\cdot \mathrm{M}}{{\mathrm{N}}_{\mathrm{A}}\cdot {\mathrm{a}}^3}\\ & \mathrm{M}=\frac{\mathrm{d}\times {\mathrm{N}}_{\mathrm{A}}\cdot {\mathrm{a}}^3}{\mathrm{Z}}=\frac{8.57\times 6.022\times 10^{23}\times {\left(3.3\times 10^{-8}\right)}^3}{2}\\ & \mathrm{M}=93\mathrm{g}/\mathrm{mol}\end{array}$$