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JEE Main 10 April 2016 Paper
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© examsnet.com
Question : 35
Total: 90
If 100 mole of
H
2
O
2
decompose at 1 bar and 300 K, the work done (kJ) by one mole of
O
2
(
g
)
as it expands against 1 bar pressure is :
2
H
2
O
2
(
I
)
⇌
2
H
2
O
(
I
)
+
O
2
(
g
)
(
R
=
8.3
J
K
−
1
m
o
l
−
1
)
62.25
124.50
249.00
498.00
Validate
Solution:
2
H
2
O
2
(
l
)
⇌
2
H
2
O
(
l
)
+
O
2
(
g
)
W
=
−
P
ext
(
∆
V
)
=
−
(
n
O
2
)
R
T
∵ 100 mol
H
2
O
2
on decomposition will give 50 mol
O
2
W
=
−
(
50
)
(
8.3
)
(
300
)
J
=
−
124500
J
W
=
−
124.5
k
J
⇒ Work done by
O
2
(
g
)
=
124.5
kJ
© examsnet.com
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