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The order of a rate law is determined experimentally and cannot be determined using the coefficients in the reaction. However, when using the pre-equilibrium approach you use the coefficient as the exponent, but this can only be done when the observed rate law is given and you are trying to determine the rate-determining elementary step of a reaction, like how we did in class today.
Not really. The rate law is not related to the reaction coefficient. A reaction can be zero order such as rate = k, indicating the rate will not be affected by the concentration of reactant. We determine the rate law through experimental data.
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