Horvath Practice Problems 28

Horvath Practice Problems 28 - aA aB k f ­ k r cC dD(6.3...

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6 KINETICS AND EQUILIBRIUM Our next topic will be chemical equilibrium. There is a relation between kinetics and equilibrium. Last semester and up to this point we have been talking about reactions that go all the way to completion. Most reactions, however, do not go to completion but reach an equilibrium with a certain amount of reactants still left over. We can understand equilibrium from the standpoint of kinetics by not only considering the forward reaction, aA + aB k f cC + dD (6.1) but also the reverse reaction, cC + dD k r aA + bB. (6.2) These can be written as one reaction with a double arrow,
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Unformatted text preview: aA + aB k f ­ k r cC + dD. (6.3) The forward reaction rate depends on the concentration of re-actants, v f = k f [ A ] n A [ B ] n B , (6.4) while the rate of the backwards reaction depends on the con-centration of products v r = k r [ C ] n C [ D ] n D . (6.5) Equilibrium occurs when the reaction rate in both the forward and reverse directions are equal, v f = v r , (6.6) or k f [ A ] n A [ B ] n B = k r [ C ] n C [ D ] n D (6.7) k f k r = [ C ] n C [ D ] n D [ A ] n A [ B ] n B = K KINETICS AND EQUILIBRIUM 27...
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