The change in internal energy of the system after the heat is added and the system expands doing work to the surrounding is 45 J.
Change in internal energy of the system
The change in internal energy of the system is determined by applying the first law of thermodynamics as shown below;
ΔU = q - w
where;
- ΔU is the change in the internal energy
- q is heat added to the system
- w is work done to the surroundings
ΔU = 134 J - 89 J
ΔU = 45 J
Thus, the change in internal energy of the system after the heat is added and the system expands doing work to the surrounding is 45 J.
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