Determine the density of cesium chloride which cystallises in a bcc type structure with the edge length $412.1 p m .$ The atomic masses of $C s$ and $C l$ are 133 and $35.5$ respectively.

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Solution

$Z = 1$ , $a = 4.121 ˚ A$ , $M_{A} = 168.5$
$ρ = \frac{Z \times M_{A}}{N_{A} \times a^{3}}$
$ρ = \frac{1 \times 168.5}{6.023 \times 10^{23} \times 69.98 \times 10^{- 24}}$
$ρ = 4$ $g / c m^{3}$

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