__Question 12.9__: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

__Solution__:Area of ΔDEF = (1/2) DE X EF

Where,

DF = Change in pressure

= 600 N/m

^{2}– 300 N/m

^{2}

= 300 N/m

^{2}

FE = Change in volume

= 5.0 m

^{3}– 2.0 m

^{3}

= 3.0 m

^{3}

^{}Area of ΔDEF = (1/2) X 300 X 3 = 450 J

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

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