In the figure below the change in internal energy of a gas, Ask an Expert

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In the figure below, the change in internal energy of a gas that is taken from A to C along the blue path is +815 J. The work done on the gas along the red path ABC is -445 J.

1312_The change in internal energy of a gas.png

(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?

(d) If the change in internal energy in going from point D to point A is +515 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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