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For a reaction in which all reactants and products are liquids, which one of the following equations is most applicable?

1. ΔH = ΔE
2. ΔH = ΔS
3. ΔH = ΔE
4. ΔH = ΔG

Correct answer: ΔH = ΔE

Solution

For reactions involving only liquids, the change in volume is negligible, so the enthalpy change (ΔH) is approximately equal to the internal energy change (ΔE).

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