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Byju's Answer
Standard XII
Chemistry
Density
A cubic unit ...
Question
A cubic unit cell contains manganese ions at the corners and fluorides ions at the center of each edge. Calculate the density of the compound. (Given that atomic mass
M
n
=
55
amu and F is
19
amu).
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Solution
Z
M
n
+
3
=
8
×
1
8
=
1
Let the edge length be
a
˚
A
Z
F
−
=
12
×
1
4
=
3
Formula:-
M
n
F
3
M
A
=
112
,
Z
=
1
formula unit of
M
n
F
3
ρ
=
Z
×
M
A
N
A
×
a
3
⇒
ρ
=
1
×
112
6.02
×
10
23
×
a
3
×
10
−
24
=
186
a
3
g
/
c
m
3
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