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Step 1: Break each reactant down into its elements. (reverse of formation reaction), std. enthalpy change for each reactant is ñ_Hƒf.
Step 2: The appropriate elements form each product; (formation reaction). The std. enthalpy change for each product is +_Hƒf .
Concept 6-14. How a reaction combines the decomposition of
reactants and the formation of products
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