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CsBr crystallises in a body centred cubic lattice. The unit cell length is 436.6 pm. Given that the atomic mass of Cs = 133 and that of Br = 80 amu and Avogadro number being = $6.023 \times 10^{23}mol^{–1}$.CsBr, the density of CsBr is

$4.25g/cm^3$