Question
Question: A gas undergoes a change of state during which 100 J of heat is supplied to it and it does 20 J of w...
A gas undergoes a change of state during which 100 J of heat is supplied to it and it does 20 J of work. The system is brought back to its original state through a process during which 20 J of heat is released by the gas. The work done by the gas in the second process is –
A
60 J
B
40 J
C
80 J
D
20 J
Answer
60 J
Explanation
Solution
In first process (izFke izŘe esa)
Q = W + DU
100 = 20 + DU
DU = 80 J
In return process
– 20 = W – 80 Ž W = 60 J