∆H ∆E in all the cases except one:
Correct answer: D. For gas phase rex. having greater no. of moles of product.
- A. For liquids
- B. for solids
- C. for Any in gas phase rex
- D. For gas phase rex. having greater no. of moles of product.
Explanation
The answer is for gas phase reactions having greater number of moles of products.The enthalpy change (∆H) and the internal energy change (∆E) are almost always equal for liquids and solids. This is because the energy changes in these phases are primarily due to changes in the potential energy of the molecules, and these changes are similar for both ∆H and ∆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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