KF crystallizes in fcc structure like sodium chloride, calculate the distance between k+ and f- in kf. density of kf is 2.48g cm-3
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KF has NaCl type structure. What is the distance (in
A
˚
) between K
+
and F
−
in KF if density of KF is 2.48 g cm
−3
?
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ANSWER
As we know,
Density =
V×N
A
n×M
The structure of NaCl is formed by repeating the face centred cubic unit cell.
Hence, n=4
Density=2.48g cm
−3
2.48=
a
3
×6×10
23
4×58
a=5.4 A
0
Distance between K
+
and F
−
=
2
a
=2.7 A
0
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