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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.
A reaction is said to be second order when the overall order is two. The rate of a second-order reaction may be proportional to one concentration squared, or (more commonly) to the product of two concentrations.or a typical second-order reaction with rate equation, if the concentration of reactant B is constant then, where the pseudoâfirst-order rate constant. The second-order rate equation has been reduced to a pseudoâfirst-order rate equation, which makes the treatment to obtain an integrated rate equation much easier.