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Standard Enthalpy of Formation (deltaH) is the most stable form of a molecule. You would use: ΔH(of formation) = Sum of ΔH(of formation of products) - ΔH(of formation of reactants). This is the 3rd method to find enthalpy changes from last weeks lecture.
delta H of formation is the change in enthalpy during the formation of one mole of the substance from its constituent elements. It's used in calculating the change in enthalpy of a reaction, where we calculate the delta formation of the products and subtract that of the reactants from it.
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