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Question -

A thermodynamic system is taken from an original state to an intermediate state by the linear process shown in Fig. (12.13)
Its volume is then reduced to the original value from E to F by an isobaric process. Calculate the total work done by the gas from D to E to F



Answer -

Total work done by the gas from D to E to F = Area of ∆DEF

Area of ∆DEF = (1/2) x DE x EF

Where,

DF = Change in pressure

= 600 N/m2 –300 N/m2

We get,

= 300 N/ m2

FE = Change in volume

= 5.0 m3 –2.0 m3

We get,

= 3.0 m3

Area of ∆DEF = (1/ 2) x 300 x 3

On further calculation, we get,

= 450 J

Hence, the total work done by the gas from D to E to F is 450 J

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