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Question
A piston-cylinder device initially contains 0.2 m3 neon (assume ideal) at 300 kPa inside at T∘2C. A valve is now opened and neon is allowed to escape until the volume reduces to half the initial volume. At the same time, heat transfer with outside at T∘2C ensures a constant temperature inside.
Select correct statement(s) for given process.
A piston-cylinder device initially contains 0.2 m3 neon (assume ideal) at 300 kPa inside at T∘2C. A valve is now opened and neon is allowed to escape until the volume reduces to half the initial volume. At the same time, heat transfer with outside at T∘2C ensures a constant temperature inside.
Select correct statement(s) for given process.
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Solution
The correct options are
B ΔU may not be zero
C q may be +ve
D q may be −ve
Given that:- 0.2m3Ne at 300kPa at T1℃Vi=0.2m3Vf=12Vi=0.1m3Temperature inside the cylinder is constant as volume of gas is less and pressure is constant to maintain air temperature.q may be −ve or +ve.ΔU≠0 as ΔnRT≠0Hence (B), (C) and (D) are correct.
B ΔU may not be zero
C q may be +ve
D q may be −ve
Given that:- 0.2m3Ne at 300kPa at T1℃
Vi=0.2m3
Vf=12Vi=0.1m3
Temperature inside the cylinder is constant as volume of gas is less and pressure is constant to maintain air temperature.
q may be −ve or +ve.
ΔU≠0 as ΔnRT≠0
Hence (B), (C) and (D) are correct.
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