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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.
The enthalpy of hydration is always exothermic, since it involves bond making. The lattice energy contribution is always endothermic, since it involves breaking the ionic bonds between the positive and negative ions in the molecule.