Question: In Figure P20.40, the change in internal energy of a gas that is taken from A to C is 800 + J. The work done

In Figure P20.40, the change in internal energy of a gas that is taken from A to C is "800 + J. The work done on the gas along path ABC is - 500 J.
(a) How much energy must be added to the system by heat as it goes from A through B to C?
(b) If the pressure at point A is five times that of point C, what is the work done on the system in going from C to D?
(c) What is the energy exchanged with the surroundings by heat as the cycle goes from C to A along the green path?
(d) If the change in internal energy in going from point D to point A is "500 J, how much energy must be added to the system by heat as it goes from point C to point D?

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