During adiabatic compression, change in internal energy of 1 mole of a gas is 100 J. The work done is:
Correct answer: B. -100 J
- A. 100 J
- B. -100 J
- C. 200 J
- D. 1/100 J
Explanation
For an adiabatic process, the change in internal energy (ΔU) is related to the work done (W) by the equation ΔU=−W. Therefore, if ΔU is 100 J, then W=−100 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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