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Q.

CsBr crystallises in a body centred cubic lattice. The net cell length is 436.6 pm. Given that the atomic mass of Cs = 133 and that of Br = 80 amu and Avogadro number being 6.02×1023mol-1, the density of CsBr is

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a

8.25 g/cm3

b

4.25 g/cm3

c

42.5 g/cm3

d

0.425 g/cm3

answer is B.

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Detailed Solution

Z for CsBr = 1 

(Since, one effective molecule is present) one is Cs atom and one is Br atom. 

d=ZMN0a3

  =1×213(4.366×10-8)3×6.02×1023=4.25g/cm3

for unit cell, 8.502g/cm3

=4.25g/cm3

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