CsBr crystallizes 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 6.02 10 23 mol -1 , the density of CsBr is:-

1. A. 42.5 g/cm 3
2. B. 0.425 g/cm 3
3. C. 8.25 g/cm 3
4. D. 4.25 g/cm 3

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