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UPSEE Solved Model Paper 1
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© examsnet.com
Question : 18
Total: 150
A gasoline engine takes in 5 moles of air at 20° C and 1 atm, and compresses it adiabatically to 110th of the original volume. Find the change in internal energy. (Assume air to be diatomic)
92 kJ
23 kJ
46 kJ
82 kJ
Validate
Solution:
P
1
= 1 atm, n = 5,
T
1
= 293 K
V
2
=
v
1
10
Now,
P
1
V
1
x
=
P
2
V
2
x
P
2
= 25.12 atm
Similarly,
T
1
V
1
x
−
1
=
T
2
V
2
x
−
1
T
2
= 736K
Work done =
n
R
(
T
1
−
T
2
)
x
−
1
= - 46kJ
ΔU = ΔH - W = 0 - W = 46 kJ
© examsnet.com
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