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Manipal Entrance Test 2014 Chemistry Paper
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© examsnet.com
Question : 22
Total: 60
Equal moles of
N
O
2
(
g
)
and
N
O
(
g
)
are to be placed in a container to produce
N
2
O
according to the reaction,
N
O
2
+
N
O
⇌
N
2
O
+
O
2
;
K
C
=
0.914
How many moles of
N
O
2
and
N
O
be placed in the
5.0
L
container to have an equilibrium concentration of
N
2
O
to be
0.05
M
?
0.5115
0.1023
0.0526
0.2046
Validate
Solution:
Equilibrium concentration of
N
2
O
=
O
2
=
0.05
M
Let the equilibrium concentration of
NO
2
and NO be
x
M
K
c
=
0.917
=
(
0.05
)
2
x
2
⇒
x
=
0.0522
M
Initial concentrations of
NO
2
and NO were
0.05
+
x
=
0.1022
M
each.
Hence, moles of each gas
NO
2
and NO taken initially
=
5
×
0.1022
=
0.511
© examsnet.com
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