Air was heated by an electric resitance heater in an insulated piston-cylinder device. the piston weight remained constant during the process. the surroundings were at 100 kpa and 27 degrees celsius. The inital parameters of the air in the cylinder were 10 L, 200kpa, and 27 degrees celsius. The heater has the power of 600 W and it operated for 5 min. determine the energy destroyed during this process.