In the figure below, the change in internal energy of a gas that is taken from A to C along the blue path is +855 J. The work done on the gas along the red path ABC is -465 J. P D -V (a) How much energy must be added to the system by heat as it goes from A through B to C? 1320 J (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 gas goes from C to A along the green path? -948 J (d) If the change in internal energy in going from point D to point A is +515 3, how much energy must be added to the system by heat as it goes from point C to point D? -1463 J

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