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Byju's Answer
Standard XII
Chemistry
Fruendlich Isotherm
Calculate pre...
Question
Calculate pressure required for 50% dissociation of
P
C
l
5
. If the
K
p
at that temprature is 1.8 atm.
A
3
atm
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B
5.4
atm
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C
9
atm
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D
none
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Solution
The correct option is
D
5.4
atm
P
C
l
5
⇌
P
C
l
3
+
C
l
2
given,
K
p
=
1.8
Moles of different gases at equilibrium are
P
C
l
5
=
0.5
moles
P
C
l
3
=
0.5
moles
C
l
2
=
0.5
moles
therefore, total number of moles
=
1.5
moles
Partial pressure are
P
P
C
l
3
=
P
P
C
l
5
=
P
C
l
2
=
0.5
1.5
P
where
P
is total pressure in atmosphere.
K
p
=
(
P
P
C
l
3
)
(
P
C
l
2
)
(
P
P
C
l
5
)
=
(
0.5
1.5
)
2
P
2
(
0.5
1.5
)
P
=
1
3
P
1
3
P
=
1.8
P
=
5.4
atm
⇒
Pressure is
5.4
atmosphere.
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