dH and dE have same values for the reaction in _?
Correct answer: C. Liquids, solids and solution
- A. Solid phase
- B. Gases phase
- C. Liquids, solids and solution
- D. None of these
Explanation
This is often the case for reactions that take place in open containers or in systems where the pressure remains relatively constant. In such situations, the heat exchanged with the surroundings is mainly responsible for the change in enthalpy, and the work done against the surroundings (which is related to changes in volume) is not a significant factor. Therefore, dH and dE can be considered to have the same values under these conditions. So "liquids, solids and solutions" have same values.
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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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