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Since delta H is equal to the energy of products - reactants, if delta H is positive, the energy of the products will be larger than the energy of the reactants meaning that there is an input of energy and the reaction is endothermic. If the energy of the reactants is greater than the energy of the products, energy is given off and thus the reaction is exothermic.
A negative delta H is exothermic as energy is released because the reactants have a higher amount of energy in comparison to the products. This results in the reaction releasing energy as the products are in a lower energy and more stable state.
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