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:
ΔE = internal energy, J
q = heat, J
w = work, J
What is the ΔE (in J) of system that absorbs 12.4 J of heat and does 4.2 J of work on the surroundings?
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