The container shown in Fig. has two chambers, separated by a partition, of volumes V1 = 2.0 litre and V2= 3.0 litre. The chambers contain µ1 = 4.0and µ2 =5.2 moles of a gas at pressures p1= 1.00 atm and p2 = 2.00 atm. Calculate the pressure after the partition is removed and the mixture attains equilibrium.

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    Answered by

    Payal Gupta | Contributor-Level 10

    4 months ago

    This is a short answer type question as classified in NCERT Exemplar

    V1=2L ,V2=3L

    µ1 = 4.0and µ2 =5.2

    p1= 1.00 atm and p2 = 2.00 atm

    p1V1= µ1RT1

    p2V2= µ2RT2

    when the partition is removed the gases get mixed without any loss of energy . the mixture now attains a common equilibrium pressure and total volume of the system is sum of the volume of individual chambers V1 and V2

    μ = μ 1 + μ 2 , V =V1+V2

    From the kinetic theory of gases pV=2/3 E

    For mole 1  ,P1V1= 2/3 μ 1 E 1

    For mole 2  , P2V2= 2/3 μ 2 E 2

    Total energy is ( μ 1 E 1 + μ 2 E 2 )= 3/2 ( P 1 V 1 + P 2 V 2 )

    PV==2/3Etotal = 2/3 μ E p e r m o l e

    P( V 1 + V 2 )= 2 3 × 3 2 ( p 1 V 1 + p 2 V 2 )

    P= P 1 V 1 + P 2 V 2 V 1 + V 2 = 1 × 2 + 2 × 3 2 + 3 a t m

    P=8/5 =1.6atm

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