Notifications
Clear all
0
03/10/2021 11:57 am
Topic starter
An ideal gas occupying a volume of 2dm3 and a pressure of 5 bar undergoes isothermal and irreversible expansion against external pressure of 1 bar. The final volume of the system and the work involved in the process is
(a) 10 dm3, 1000 J
(b) 8 dm3, -800 J
(c) 10 dm3, -800 J
(d) 10 dm3, -1000 J
1 Answer
0
03/10/2021 12:03 pm
Correct answer: (c) 10 dm3, -800 J
Explanation:
P1V1 = P2V2
∴ V = \(\frac{5\;bar \times 2dm^3}{1\;bar}\)
= 10 dm3
Work, W = -Pext(Vfinal - Vinitial)
= -1 bar (10 - 2)
= -1 x 105Pa x 8 x 10-3 m3
= -800 J