A system goes from P-Q by two different pats in the P-V diagram as shown in Fig. Heat given to the system in path 1 is 1000 j.

Question

A system goes from P to Q by two different pats in the P-V diagram as shown in Fig. Heat given to the system in path 1 is 1000 j. the work done by the system along path 1 is more than path 2 by 100 J. What is the heat exchanged by the system in path 2?

Answer 1

For path 2,

∆Q = ∆U + ∆W

For path 1,

1000 = ∆U + (∆W + 100)

or, ∆U = ∆W = 900

or, ∆Q = 900 J