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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.
Conclusion: the reaction is first order in A. 3) The rate law for this reaction is: 4) We can use any set of data to calculate the rate constant: 9.6 x 10 -6 M s -1 = k (0.040 M) (0.040 M). k = 0.0060 M -1 s -1. Comment: remember that M -1 s -1 is often written as L mol -1 s -1.ften the rate constant unit is rendered thusly: L 2 mol -2 s -1. Note that the overall order of the rate law is third order and that this is reflected in the unit associated with the rate constant.