A Cs crystal having unit cell length \( 436.6 \mathrm{pm} \) given ...

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A Cs crystal having unit cell length \( 436.6 \mathrm{pm} \) given that atomic mass of \( \mathrm{Cs}=133 \) and that of \( \mathrm{Br}=80 \mathrm{amu} \) respectively. The density of \( \mathrm{CsBr} \) is
(1) \( 42.5 \mathrm{~g} / \mathrm{cc} \)
(2) \( 0.425 \mathrm{~g} / \mathrm{cc} \)
(3) \( 8.25 \mathrm{~g} / \mathrm{cc} \)
(4) \( 4.25 \mathrm{~g} / \mathrm{cc} \)
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