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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.
ORDER OF REACTION. Sum of the powers of the concentration terms in the rate equation is called overall order of the reaction. Hence the order of above reaction = x + y + z. * The order of a reaction and hence the rate law must be determined experimentally and cannot be predicted from the stoichiometric equation. However in the cases of simple reactions, the rate expression can be written according to the stoichiometric equation.