Problem: A system absorbs 159 kJ of heat, and performs 84 kJ of work on the surroundings. What is ΔE of the system?

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We are being asked to calculate ΔE or the internal energy of the system. The internal energy (ΔE or ΔU) of a system can be calculated from the heat and work of the system. The relationship between internal energy, heat, and work is shown in the following equation:

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A system absorbs 159 kJ of heat, and performs 84 kJ of work on the surroundings. What is ΔE of the system?

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