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Enthalpy of a reaction or energy change of a reaction D H, is the amount of energy or heat absorbed in a reaction. If the energy is required, D H is positive, and if energy is released, the D H, is negative.
1. enthalpy - (thermodynamics) a thermodynamic quantity equal to the internal energy of a system plus the product of its volume and pressure; enthalpy is the amount of energy in a system capable of doing mechanical work. heat content, total heat, H.