Energy_Balances_on_Reactions

Energy_Balances_on_Reactions - Energy Balances on Chemical...

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Energy Balances on Chemical Reactions Relationship to mass balances Vocabulary Heat of reaction What is it? How can we calculate it? Heat of Combustion (why we care) Combustion terms
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Just as in Mass Balances. . . Stoichiometric coefficients of reactants are NEGATIVE and products are POSITIVE Remember our friend ξ?
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ΔH r Energy is required to form bonds and released when breaking bonds Total amount of energy required or released determines enthalpy of reaction – Can also find ΔU r = ΔH r – RT(Σν I,p -Σν I,r ) BUT: for open system (i.e. chemical process in plant), ΔH = Q+W
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ΔH r • ΔH r IS temperature dependant and (weakly) pressure dependant Reference State ( products and reactants at 25 o C, 1atm) Measurement problems - reaction may not proceed at reference T What can we do to get around these?
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Calculating ΔH r ΔH r Reactants at T 1 Products at T 1 Cp, Cp, Reactants Products ΔH r 0 Reactants at T 2 Products at T 2
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Hess’s Law Enthalpy is a state function!
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