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.