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Byju's Answer
Standard XII
Chemistry
Percentage Composition
CH3CH2CH2CH3g...
Question
C
H
3
C
H
2
C
H
2
C
H
3
(
g
)
⇌
C
H
3
−
C
|
H
C
H
3
i
s
o
−
b
u
t
a
n
e
−
C
H
3
(
g
)
A
75
%
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B
90
%
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C
30
%
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D
60
%
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Solution
The correct option is
A
75
%
K
c
for the above reaction is represented as
K
c
=
i
s
o
b
u
t
a
n
e
b
u
t
a
n
e
(
i
s
o
b
u
t
a
n
e
)
=
3
(
b
u
t
a
n
e
)
So the concentration of sobutane is thrice of butane in 100% solution of the isobutane and butane.
So isobutane
=
75
%
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Similar questions
Q.
For the equilibrium,
C
H
3
C
H
2
C
H
2
C
H
3
(
g
)
⇌
C
H
3
−
C
H
|
C
H
3
(
i
s
o
−
b
u
t
a
n
e
)
−
C
H
3
(
g
)
If the value of
K
C
is
3.0
, the percentage by mass of iso-butane in the equilibrium mixture would be :
Q.
C
H
3
−
O
H
|
C
H
−
C
H
2
−
C
H
3
A
l
2
O
3
−
−−
→
573
K
C
H
3
−
C
H
=
C
H
−
C
H
3
Butane-2-ol But-2-ene
Q.
C
H
3
−
C
H
2
−
C
H
|
C
l
−
C
H
3
obtained by chlorination of n-butane, will be
Q.
If enthalpy of formation of
C
H
3
−
C
H
3
(
g
)
,
C
H
3
−
C
H
2
−
C
H
3
(
g
)
a
n
d
C
H
3
−
C
H
2
−
C
H
2
−
C
H
3
(
g
)
are
20
k
c
a
l
/mole,
25
k
c
a
l
/mol and
30
k
c
a
l
/
m
o
l
respectively, then enthalpy of formation of
C
H
3
−
C
H
2
−
C
H
2
−
C
H
2
−
C
H
2
−
C
H
3
(g) is:
Q.
Arrange the following alkanes in decreasing order of their heats of combustion
(i)
C
H
3
−
C
H
3
|
C
|
C
H
3
−
C
H
3
(Neo- pentane)
(ii)
C
H
3
−
C
H
|
C
H
3
(Iso - pentane)
(iii)
C
H
3
−
C
H
2
−
C
H
2
−
C
H
2
−
C
H
3
(n -pentane)
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