Dear Student, Edge legth of the unit cell of AB, a= 2×(d+-d-) = 2y13×10-9 mFor rock salt structure, Z=4d=Z×MNA×a3=4×6 023 y gmol-16 023×1023 mol-1×(2y13×10-9 m)3or, d=5 kgm-3Observed densitytheoretical density=205= 4:1

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Dear Student,

Edge legth of the unit cell of AB, a = 2 \times (d_{+} - d_{-}) = 2 y^{\frac{1}{3}} \times 10^{- 9} m For rock salt structure, Z = 4 d = \frac{Z \times M}{N_{A} \times a^{3}} = \frac{4 \times 6.023 y {gmol}^{- 1}}{6.023 \times 10^{23} {mol}^{- 1} \times (2 y^{\frac{1}{3}} \times 10^{- 9} m)^{3}} or, d = 5 {kgm}^{- 3} \frac{Observed density}{theoretical density} = \frac{20}{5} = 4 : 1

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