Which substance has ∆E = ∆H and no pressure-volume work:
Correct answer: D. Liquids and solids
- A. Liquid only
- B. Solid only
- C. Gases
- D. Liquids and solids
Explanation
In case of liquids and solids, the changes in state do not cause significant volume change i.e. ∆V = 0. For such process, ∆H and ∆E are approximately the same i.e. ∆H≈∆ E.
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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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