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If a system has 30 joules of heat added to it and the total change in its internal energy is 10 Joules how much work does it do?​

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Answer:

Internal energy (U) is the total energy of the system. All else being equal, if you add 30 J to the system, the U would change by + 30J. Then, if the system does 20 J of work on the surroundings, it would lose 20 J. So the net change in internal energy, ∆U = +10 J.

Explanation:

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