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CsBr crystallises in a body centred cubi...

CsBr crystallises in a body centred cubic lattice. The unit cell length is 436 pm. Given that the atomic mass of Cs = 133 and that of Br = 80 amu and Avagadro number being `6.02xx10^(23)mol^(-1)` the density of CsBr is

A

`8.5g//cm^(3)`

B

`4.25g//cm^(3)`

C

`42.5g//cm^(3)`

D

`0.425g//cm^(3)`

Text Solution

Verified by Experts

The correct Answer is:
a
Density `=(zxxM)/(a^(3)xxN_(A))`
`( :' z=2` for `b.c.c.` and `M_(CsBr)=213)`
`=(2xx213)/((4.366xx10^(-8))^(3)xx6.023xx10^(23))`
`=8.50g//cm^(3)`
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