During the transition from one state to another, the thermodynamic system does work; equal to 6 kJ. In this case, the internal energy of the system decreases. What is the change in the internal energy of the system?
If the process took place without heat exchange with the environment, then the change in internal energy is equal to the work done: U = A = 6 kJ.
Internal energy will decrease by 6 kJ.
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