Interpretation:
The pre-equilibrium mechanism in the given reaction results in an overall third-order reaction has to be shown.
Concept introduction:
Pre-equilibrium: Consider a reaction that is more complicated mechanism in which an intermediate I reach equilibrium with the reactants A and B:
This above scheme involves a pre-equilibrium, in which an intermediate is in equilibrium with the reactants. A pre-equilibrium arises when the rate of decay of the intermediate back into reactants is much faster than the rate at which it forms products; the condition is satisfied if
Rate law or rate equation: The relationship between the reactant concentrations and
Rate of the reaction
Total order of the reaction

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Chapter 17 Solutions
PHYSICAL CHEMISTRY-WEBASSIGN
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