Q: A system can be taken (p1 , V1 ) to (p2 , V2 ) , by two different methods. Let ∆Q and ∆W represent the heat given to the system and the work done by the system. Which of the following must be the same in both the methods ?
(c) ∆Q + ∆W
(d) ∆Q – ∆W
Sol: A system can be taken (p1 , V1 ) to (p2 , V2 ) by two different methods . Since initial and final states are same for two processes .
∆U1 = ∆U2
∆U1 = ∆U2 = ∆Q – ∆W