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The rate law is an expression for the reaction rate in terms of concentrations of chemical species involved in the reaction. For example, Rate = k [A]m [B]n. where k is a rate constant, m is reaction order with respect to A, n is the reaction order with respect to B, and m+n is the overall reaction order. The rate constant is independent of the concentrations of the chemical species involved in the reaction.
We would describe this reaction as third-order overall, first-order in A, second-order in B, and zero-order in C. Zero-order means that the rate is independent of the concentration of a particular reactant.eaction order. The order of a rate law is the sum of the exponents in its concentration terms. For the N2O5 decomposition with the rate law k[ N2O5 ], this exponent is 1 (and thus is not explicitly shown); this reaction is therefore a first order reaction.