The rate law relates the reactant's concentration with the rate of reaction. Yes, it is possible for more than one mechanism to be consistent with the rate law.
The rate law has been defined as the concentration of the reactants involved in a reaction that can be presented by the multi-step mechanism that is consistent with the rate law (experimental).
More than one mechanism has to be consistent with the rate law of the reaction that is defined by the rate-determining step. Macro rate law must agree with the slowest elementary step in a mechanism's rate law.
Therefore, it is possible for a mechanism to be consistent with rate law.
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