a) A 4kg of steam in a piston-cylinder device undergoes an expansion from state 1 (u1=2709.9kJ/kg) to state 2 at u2. During the process, there are: - heat transfer to the steam of 160kJ - heat loss to the surrounding of 30kJ. - work input to the steam of 40kJ - work done by the steam of 200kJ i. Neglect kinetic and potential energy. Draw the energy transfer and system diagram based on provided data above. Label and give the value for the energy included sign. (4 marks) ii. Determine the change of internal Energy (4 marks)