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3. (20 pts) In the Carnot engine (refer to the figure in question 2), an ideal...

3. (20 pts) In the Carnot engine (refer to the figure in question 2), an ideal gas undergoes a cycle of isothermal expansion (A → B), adiabatic expansion (B → C), isothermal compression (C → D), and adiabatic compression (D → A). All processes are assumed to be reversible. The volumes at the points are given that 2VA=VB and VC=2VD. Th is 650 °C and Tc is 30 °C. (1)

Calculate the amount of heat added to one mole gas in the engine (isothermal expansion process).

(2) Calculate the amount of heat removed from one mole gas in the engine (isothermal compression process).

(3) Calculate the thermal efficiency of this engine.

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