lecture 13 - CHE 349, Lecture 18 Heat of Reaction Heat of...

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CHE 349 - Lecture 18 by Jing Wu 1 Heat of Reaction Heat of reaction at temperature T : [ H Rx ] ) ( ) ( ) ( ) ( T H T H a b T H a c T H a d A B C D + = H Rx CHE 349 - Lecture 18 by Jing Wu 2 X F T H H H F H F F H A Rx i i n i i A i i n i i i n i 0 0 1 0 1 0 0 1 ) ( ) ( Θ = = = = ( ) ( ) ( ) () ( ) X F H H a b H a c H a d H H H H H H H H H H F H F F H A A B C D I I I D D D C C C B B B A A A i i n i i i n i 0 0 0 0 0 0 0 1 0 0 1 + + + Θ + Θ + Θ + Θ + = = = H Rx ) ( ) ( ) ( ) ( T H T H a b T H a c T H a d A B C D + + + = Dissecting the Molar Flow Rate IV CHE 349 - Lecture 18 by Jing Wu 3 Steady-State Energy Balance With Enthalpy 0 ) ( ) ( 0 0 1 0 = Θ + = X F T H H H F W Q A Rx i i n i i A S & & X F T H H H F H F F H A Rx i i n i i A i i n i i i n i 0 0 1 0 1 0 0 1 ) ( ) ( Θ = = = = 0 1 0 0 1 = + = = i i n i i i n i S H F H F W Q & & CHE 349 - Lecture 18 by Jing Wu 4 In Summary 0 ) ( ) ( 0 0 1 0 = Θ + = X F T H H H F W Q A Rx i i n i i A S & & ) ( ) ( ) ( ) ( T H T H a b T H a c T H a d A B C D + = H Rx D a d C a c B a b A + + 0 ) ( 0 1 0 0 = Θ = X F T H dT C F W Q A Rx n i T T pi i A S i & &
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CHE 349 - Lecture 18 by Jing Wu 5 Dissecting the Enthalpies • We are neglecting any enthalpy changes on mixing so that the partial molal enthalpies are equal to the molar enthalpies of the pure components. • The molar enthalpy of species i at a particular temperature and pressure, H i , is usually expressed in terms of an enthalpy of formation of species i at some reference temperature T R , H i °( T R
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lecture 13 - CHE 349, Lecture 18 Heat of Reaction Heat of...

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