b) Determine the change in internal AU. 2.A Piston cylinder contains 3 kg of water at 20°C and 5 bar. Heat is added, the water heats up,boils, becomes steam, and

the piston moves out until the temperature reaches 320°C, and pressure is at 5 bar. (12 points) a) Calculate the work done by the fluid c) How much heat is added to the fluid?