Q.

50L of a certain liquid is confined in a piston system at the external pressure 100atm. This pressure is suddenly released and liquid is expanded against the constant atmospheric pressure, volume of the liquid increases by 1L and the final pressure on the liquid is 10atm. Find the work done :

 

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a

50L atm

b

500 L atm

c

5L atm

d

1 L atm

answer is A.

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Detailed Solution

The external pressure  =100atm

Change in volume  =51-50=1L

Work done for constant pressure  =PΔV-100×1-100 J  1Latm=100 J

Hence work done= 1Latm

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