2) In a hypothetical experiment, a substance inside a piston is at equilibrium state A. It is brought to equilibrium state B by the surroundings performing 500 kJ of work on the system, and by transferring heat in the amount of 100 kJ into it (the system). This step happens very fast. After some time, the system is taken from state B back to state A by removing 400 kJ as heat. Questions: What are the initial and final states? What is AU? How much work is required for the B-to-A transition?. What are the net amounts of work and heat involved in the process? Is this process reversible