\( \mathrm{CsBr} \) crystallises in a body-centred cubic lattice. The unit cell length is \( 436...

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\( \mathrm{CsBr} \) crystallises in a body-centred cubic lattice. The unit cell length is \( 436.6 \mathrm{pm} \). Given that the atomic mass of \( \mathrm{Cs}=133 \) and that of \( \mathrm{Br}=80 \mathrm{amu} \) and Avogadro number being \( =6.02 \times 10^{23} \) \( \mathrm{mol}^{-1} \), the density of \( \mathrm{CsBr} \) is:
(a) \( 8.25 \mathrm{~g} / \mathrm{cm}^{3} \)
(b) \( 4.25 \mathrm{~g} / \mathrm{cm}^{3} \)
(c) \( 42.5 \mathrm{~g} / \mathrm{cm}^{3} \)
(d) \( 0.425 \mathrm{~g} / \mathrm{cm}^{3} \)
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