A rate law shows how the rate of a chemical reaction depends on reactant concentration. For a reaction such as _a_ A -> products, the rate law generally has the form rate = _k_ [A] _ⁿ_ , where _k_ is a proportionality constant called the rate constant and _n_ is the order of the reaction with respect to A. The value of _n_ is not related to the reaction stoichiometry and must be determined by expe
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