Grade 12Physical Chemistry
An ionic crystal AB crystallises in bcc lattice. If the cationic radius is 1.7 Å and anionic radius is 1.8 Å,then find out the density of crystal AB (formula mass of AB is 168.5 g/mol; 
)
1 Answer
Arun
Density =ρ=
N
A
×a
3
Z×M
A
Mass of FeO=56+16=72
Given,
Z=?
a=5.0
A
˚
M
A
=72
ρ=4 g/cm
3
N
A
=6.023×10
2
3
4=
6.023×125×10
−24
Z×72
Z=4
Therefore, appoximately 4 molecules of FeO are present in a unit cell.
Y=4X
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