Answer :
(a) The heat generated in the process is 28 kJ.
(b) The work done in the process is determined as -28 kJ.
(c) The change in the internal energy is 0.
Heat of the isothermal compression
The heat generated in the process is negative done in the process.
W = -PΔV
W = -P(V₂ - V₁)
From A to B
W = -P(VB - VA)
W = -11(7 - 12.5)
W = 60.5 L.atm = 60.5 x 101.325 J/L.atm = 6,130.16 J
From C to D
W = -25(20.5 - 7)
W = -337.5 L.atm = -34,197.18 J
Total work , w = -34,197.18 J + 6,130.16 J = -28 kJ
q = - w
q = 28 kJ
Change in internal energy
ΔE = q + w
ΔE = 28 kJ - 28 kJ = 0
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