Ncert Exercises & Solutions

12.9 A thermodynamic system is taken from an original state to an intermediate state by the linear process shown in Fig. (12.13)

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.

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

Area of ΔDEF = $\frac{1}{2} DF \times EF$

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

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