L29-Energy_Balance_Reactive_System

# L29-Energy_Balance_Reactive_System - Energy Balancein...

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1 Energy Balance- in Reactive System

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2 LEARNING OBJECTIVES By the end of this topic, you should be able to: Highlight previous lectures Heat of Formation Heat of Combustion Performed energy balance for reactive system
3 ENERGY BALANCES ON REACTIVE  PROCESSES Previous lecture  Heat of reaction   Ĥ  r   = Ĥ product  - Ĥ reactant     EXO Ĥ (T, P): -ve and   ENDO Ĥ (T, P): +ve   Ĥ  r    nearly independent of pressure      Ĥ  (T)  Value depends on the stoich. Equations  Value of heat of reaction dep. on the phases of  reactants and products  Standard heat of reaction  Ĥ o r  -  reactants and  products at a specified reference temperature and  pressure

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4 ENERGY BALANCES ON REACTIVE  PROCESSES * Hess’s Law Hess’s Law * General statement of Hess’s Law  If the stoich. Equation of for rxn 1 can be obtained by  algebraic operations  on stoich. of reaction 2, 3 . Then the heat of reaction  Ĥ o r 1 can be obtained  by  performing the same operations on the heats of reactions  Ĥ o r 2 , Ĥ o r 3   *  Standards heat of formation  Ĥ o f = enthalpy changes when  1 mole of  compound formed at a reference  temperature and pressure (in our text 25 o and 1 atm) * Heat of reaction from heat of formation:  - = = reactants fi o i products fi o i fi o i i r o H Δ ν H Δ ν H Δ ν H Δ
5 ENERGY BALANCES ON REACTIVE  PROCESSES * Standards heat of formation: example to find heat of  reaction from heats of  formation * Heats of Combustion * Energy Balances on Reactive Process -  General procedures * Today lecture Today lecture

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6 EXAMPLE 1 *  Determination of heats of reaction from heats of formation
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L29-Energy_Balance_Reactive_System - Energy Balancein...

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