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You would use the (deltaH of bonds broken - deltaH of bonds formed). In order to figure out which bonds are broken and formed you look at the lewis structures. You could just break every bond in reactants and from every bond in the products if that is easier for you.
You would need the enthalpy of each bond in the reaction broken and each bond in the reaction formed. Add these values together to get the total change in enthalpy.
You would determine the change in phases and find the bond enthalpy. You subtract the bond enthalpy of the reactants from the bond enthalpy of the products
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