Which one of the following is the correct demonstration of the first law of thermodynamics?
Correct answer: D. ∆E = q + w
- A. ∆H=q + w
- B. ∆H= qw
- C. ∆H=q - ∆P∆V
- D. ∆E = q + w
Explanation
The first law of thermodynamics states that energy can neither be created nor be destroyed, but can change from one form to another. Therefore, the correct representation of this law is:ΔE = q + wwhere ΔE is the change in internal energy, q is the heat supplied to the system and w is the work done by the system.
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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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