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In a process, 5 kJ of heat is absorbed by a system and 1 kJ of work is done by the system. What is the change in internal energy for the process?

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According to first law of thermodynamics,
U = Q+W
Where U = change in internal energy
Q = heat
W = work
According to this, there are two kinds of processes that can lead to a change in the internal energy of the system – they are heat and work.
Q = + 5kJ
W = -1 kJ

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