Question

A thermodynamic system is taken from an original state to an intermediate state by the linear process shown in Fig. (11.13).

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 1

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

Area of ΔDEF = $\frac{1}{2}\,DE×EF$

Where,

DF = Change in pressure

= 600 N/m2 – 300 N/m2

= 300 N/m2

FE = Change in volume

= 5.0 m3 – 2.0 m3

= 3.0 m3

Area of ΔDEF = $\frac{1}{2}×300×3=450\,J$

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