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it depends on whether the reaction is the elementary rate law. If the reaction is the elementary reaction one can assume that the exponent is the order in relation to the reactant. Therefore if b is squared the it is in second order while if a is to the power of 1 it is in first order. If you cannot assume that the reaction is elementary you have to find the unique rate using stoichiometric coefficients.
Ghadir Seder 1G wrote:How do we decide which experiments to use to determine the rates with respect to A and B?
First, you have to realize that C is zero order reactant. Now that C is independent and doesn't affect the other concentrations, to find the order of A, compare experiments 2 and 4 because the concentration of A changes while the concentration of B remains constant. To find the order of B, compare experiments 2 and 3 because the concentration of B changes while the concentration of A remains constant.
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