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Question

One mole of a gas is expanded from (1L, 10 atm, 300 K) to (4 L, 5 atm, 300 K) against a constant external pressure of 1 atm. The heat capacity of gas is 50 J/oC.Then the work done during the process is:
(Take 1Latm100J)

A
300 J
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B
600 J
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C
300 J
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D
100 J
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Solution

The correct option is A 300 J
State 1 State 2
(1L,10atm,300K)(4L,5atm,300K)

Since, the process is irreversible isothermal expansion (as temperature remains constant) so work done is given as:

w=Pext(V2V1)=1(41)=3 L atm=3×100 J=300 J


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