The equation of the first law of thermodynamics q=AE+W, will reduce at constant volume to:
Correct answer: D. qv = E
- A. ΔE+W
- B. qv = E +PΔV
- C. qv= E+W
- D. qv = E
- E. qv = PΔGV
Explanation
The equation of the first law of thermodynamics, q = ΔE + W, reduces at constant volume to qv = ΔE.At constant volume (no work is done), the work term (W) becomes zero. Therefore, the equation simplifies to qv = ΔE, where qv represents the heat transfer at constant volume, and ΔE represents the change in internal energy. Therefore option D is the correct answer.
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About Thermochemistry and Energetics of Chemical Reactions
Thermochemistry measures energy changes in chemical reactions and distinguishes exothermic from endothermic processes. Work covers systems, surroundings and state functions, internal energy, the first law of thermodynamics, enthalpy and Hess's law, including the sign conventions used when heat enters or leaves a system.
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