100 lb. carbon dioxide is at 32 F and 300 lbf/in.2 in a well-insulated piston-cylinder assembly. The gas is isothermally expanded until V2 = 2V1. The gas is modeled as an ideal gas and the effects of potential energy as well as kinetic energy are negligible (a) determine the internal energy change of the gas. (b) Because the insulating layer is damaged, stray heat occupies 20% of the internal energy change. Determine the final temperature of the gas. (a) The internal energy change, U=Answer Btu (b) The final temperature, T2=answer R