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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.
If we are given the reaction orders for a reaction, we have the values of the coefficients we need to write the rate law. For example, if we are told that a reaction is second order in A we know that n is equal to 2 in the rate law. Top. Determining Exponents for a Rate Law from Initial Rates (Experimental Data).