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The rate limiting step or the rate determining step is the slowest step of the reaction (of the elementary steps) that determines the rate at which the overall reaction proceeds. Usually the questions will give us which step is slow/fast. If we are given the rate law of the reaction, the slow step of the reaction will be the equation that matches up with that rate law.
Rate-limiting or rate-determining steps of a reaction are the slowest steps of the reaction because they determine the rate of the entire reaction. I believe that questions will identify which reaction is slow and which are fast.
The rate-limiting step is the slowest step in a reaction. The slowest step determines the overall rate of the reaction since the completion of the reaction depends on that step. For example, if you have a three-step reaction where the first step has a rate of 80 moles per liter per second, the second 40 moles per liter per second and the third step has 60 moles per liter per second. No matter how fast the other two reactions are taking place the reaction will not go to completion any faster than 40 moles per liter per second. This is because even if the first step is completed, the second step will take twice as much time to be completed for the same amount of reactant and thus the completion of the first and second reactions will take twice as many time units. The slowest reaction is experimentally determined.
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