Halliday, Resnick & Walker — Temperature, Heat, and the First Law of Thermodynamics: Problem 48

As a gas is held within a closed chamber, it passes through the cycle shown in Fig. 18.18. Determine the energy transferred by the system as heat during constant-pressure process \( CA \) if the energy added as heat \( Q_{AB} \) during constant-volume process \( AB \) is \( 20.0 \text{ J} \), no energy is transferred as heat during adiabatic process \( BC \), and the net work done during the cycle is \( 15.0 \text{ J} \).