Q. 134.5( 2 Votes )
Heat extracted from the system ΔQ=-70cal=-70×4.2=-294J
The negative sign is because heat is extracted from the system.
We know that work done by the gas is given as
Here since we have two values of pressure we will take average pressure.
= 350×103× (250-100) ×10-6
From first law of thermodynamics, we know that,
Where ΔQ=heat supplied to the system
ΔU=change in internal energy
ΔW=work done by the system
∴ change in internal energy is -241.5J.
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