A system absorbs 1000 Joules of heat and delivers 600 Joules of work, while losing 100 Joules of heat by conduction to the atmosphere, the change in the internal energy of the system will be:
Correct answer: C. 300 Joules
- A. 600 Joules
- B. 900 Joules
- C. 300 Joules
- D. 400 Joules
- E. 1600 Joules
Explanation
Change in internal energy of the system is given by:Change in internal energy = Heat absorbed - Work done - Heat lostChange in internal energy = 1000 - 600 - 100Change in internal energy = 300 JHence, the internal energy of the system is 300 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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