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Delta U is the change in internal energy, while Delta H is the change in enthalpy. The internal energy of a system is the total energy in the system (sum of potential and kinetic energy) while enthalpy is the heat energy that is absorbed or released in a chemical reaction. They’re related in that the change in enthalpy is equal to the internal energy of a system plus the product of the pressure and volume. They’re similar in that they both are related to the energy exchange between a system and its surroundings.
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