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Physical Chemistry

Blazing goIITian

Joined:	9 Sep 2007
Post:	640

6 Mar 2008 22:47:46 IST

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270

re solid state

None

AgCl has the same structure as that of NaCl.

the edge length of unit cell of AgCl is found to be 555pm

and the density AgCl is 5.561gm/cm^-3..
find the percentage of sites that r unoccupied???????????

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Akhil

Blazing goIITian

Joined: 17 Jan 2008

Posts: 1451

7 Mar 2008 14:15:24 IST

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use density formula as
D= n*m/ Na * V
V= volume of unit cell
m= molecular mass
n= no of molecules in the unit cell=4
Na= av . no
V= r*r*r
now we have density of complete crystals
so percentae of unoccupied cells=
D-d/D
substituting values we have
D=5570 kg/m3
and
d= 5561 kg/m3
so
percentage=0.172 %

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