If the heat absorbed is 10 J and work done is 5 J, then the change in internal energy is:
Correct answer: D. 5 J
- A. -5 J
- B. 10 J
- C. 15 J
- D. 5 J
Explanation
The change in internal energy = work done by the system + heat energy supplied to the system. The work done by the system is 5 J. Therefore, the change in internal energy = -5 + 10 = 5 J.
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About First Law of Thermodynamics
The first law relates heat supplied, work done and the change in internal energy through energy conservation. Problems use sign conventions and apply the law to isothermal, adiabatic, isobaric and isochoric processes. Internal energy is a state function, while heat and work depend on the path followed.
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