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When 2.00 kJ of energy is transferred as heat to nitrogen in a cylinder fitted with a piston at an external pressure of 2.00 atm, the nitrogen gas expands from 2.00 to 5.00 L against this constant pressure. What is ΔU for the process? 1. +2.61 kJ 2. -0.608 kJ 3. 0 4. +1.39 kJ 5. -2.61 kJ