A cylinder which is in a horizontal position contains an unknown noble gas at 5.26 Ã- 104 Pa and is sealed with a massless piston. The piston is slowly, isobarically moved inward 16.3 cm which removes 1.95 Ã- 104 J of heat from the gas. If the piston has a radius of 33.8 cm, calculate the change in internal energy of the system.