(Answered) An electrical heater delivers 8450 kj of energy as heat to

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An electrical heater delivers 8.450 kJ of energy (as heat) to asystem consisting of the gas inside a cylinder having a movablepiston. As a result, the piston moves against a constant externalpressure such that P ?V = 5.070 kJ. What is the change in internal energy for the system?

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