### Calculate the change in internal energy of the system

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A cylinder which is in a horizontal position contains an unknown noble gas at 4.63 × 104 Pa and is sealed with a massless piston. The piston is slowly, isobarically moved inward 18.9 cm which removes 1.50 × 104 J of heat from the gas. If the piston has a radius of 30.5 cm, calculate the change in internal energy of the system.

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