10 kilogrms of steam is inside a piston-cylinder. The steam goes through an iso-thermal expansion from 500 kPa and 200 degrees Celsius to 300kPa. During the expansion, 90kJ of heat is transferred to the steam. A propelling wheel transfers 20.5 kJ energy to the stream by work. KE and PE are negligible. Find the transfer of energy through work from the steam to the piston during the process in kJ.