Agas is contained in a vertical pistoncylinder assembly by a piston with a face area of 50 in2 and weight of 100 lbf.The atmosphere exerts a pressure Of14.7lbfflln2 on top ofthe pistonA paddle wheel transfers 3 Btu of energy to the gas during a process in which the elevation of the piston increases slowly by 2 ft. The piston and cylinder are poor thermal conductors, and friction between the piston and cylinder can be neglected. Determine the work done by the gas on the piston. in Btu, and the change in internal energy otthe gas, in Btu. | X Your answer is incorrect. Determine the expansion work done by the gas on the piston, in Btu