The enthalpy change ΔH of a process is given by the relation:
Correct answer: A. ΔH=ΔU+PΔV
- A. ΔH=ΔU+PΔV
- B. ΔH=ΔU-ΔnRT
- C. ΔU=ΔH+ΔP
- D. ΔH=ΔU-PΔV
Explanation
This equation is the definition of enthalpy change (ΔH) at constant pressure. It states that the change in enthalpy is equal to the change in internal energy (ΔU) plus the pressure-volume work (PΔV) done by or on the system.
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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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