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- [Standard Heat of Formation]
- Remember, the heat of reaction = (sum of the standard heat of formation of each of the products times its coefficient) - (sum of the standard heat of formation of each of the reactant times its coefficent) or :
- deltaHrxn = deltaH(products) - deltaH(reactants) (see AP cheatsheet).
- where deltaH(product)=sum of (coefficent moles of product)(standard heat of formation of product)for each product
- where deltaH(reactant)=sum of (coefficent moles of reactant)(standard heat of formation of reactants)for each rectants
The standard heat of formation, deltaHfo, you find in a book and all elements in the phase they exist at 25degrees & 1atm is zero.