The elementary step of the reaction mechanism is the rate-determining step. The coefficients of the overall reaction are not proportional to the concentration of the product.
The rate law is determined by experimentation and is determined by the rate-determining step or the slow step. The reaction can be a single or multi-step mechanism.
The elementary step has been occurring in one step and has been used as coefficients in the reaction order of the law. While overall reaction has been constituted of various steps whose coefficients are not necessarily proportional to the product.
Therefore, elementary has a single molecular step and an RDS.
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