Q.

A mixture of ideal gas containing 5 moles of monatomic gas and 1 mole of rigid diatomic gas is initially at pressure P0, volume V0, and temperature T0. If the gas mixture is adiabatically compressed to a volume V0/4, then the correct statement(s) is/are, (Given 21.2 = 2.3 ; 23.2 = 9.2 ; R is gas constant)

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a

The average kinetic energy of the gas mixture after compression is in between 18RT0 and 19RT0

b

Adiabatic constant of the gas mixture is 1.6

c

The final pressure of the gas mixture after compression is in between 9P0 and 10P0

d

The work W done during the process is 13RT0

answer is A, B, C.

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Detailed Solution

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P1=5RToVo

P2=RT0V

P1+P2=Po=6RT0V0Ymixture =5CP1+(1)CP25CV1+(1)CV2=5×5R2+(1)7R25×3R2+(1)5R2=3220=1.6PVγ= constant P0V01.6=PV0/41.6P=P0(4)1.6=Po23.2P=9.2P0

 Work =W=P2V2P1V11γ=9.2P0V04P0V011.6=(2.31)PoV00.6=1.3×6RT00.6W=13RT0|W|=13RT0TVγ1= constant TiViγ1=TfVfγ1T0V00.6=TfV040.6Tf=(2)1.2T0=2.3T0 Kinetic Energy =nCVmixTf=(6)R1.612.3T0=23RT0

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