How to find heat of reaction from heat of formation?
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Recall that standard enthalpies of formation can be either positive or negative. The enthalpy of formation of carbon dioxide at 298.15K is ΔH f = -393.5 kJ/mol CO 2(g). Write the chemicalequation for the formation of CO2. This equation must be written for one mole of CO 2(g).
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An application of Hess’s law allows us to use standard heats of formation to indirectly calculate the heat of reaction for any reaction that occurs at standard conditions. An enthalpychange that occurs specifically under standard conditions is called the standard enthalpy (or heat) of reaction and is given the symbol ΔH∘. The standard heat of reaction can be calculated by using the following equation.
ΔH∘=∑nΔH∘f(products)−∑nΔH∘f(reactants)
The symbol Σ is the Greek letter sigma and means “the sum of”. The standard heat of reaction is equal to the sum of all the standard heats of formation of the products minus the sum of all the standard heats of formation of the reactants. The symbol “n” signifies that each heat of formation must first be multiplied by its coefficient in the balanced equation.
ΔH∘=∑nΔH∘f(products)−∑nΔH∘f(reactants)
The symbol Σ is the Greek letter sigma and means “the sum of”. The standard heat of reaction is equal to the sum of all the standard heats of formation of the products minus the sum of all the standard heats of formation of the reactants. The symbol “n” signifies that each heat of formation must first be multiplied by its coefficient in the balanced equation.
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