Dear student,

A second-order reaction depends on the concentrations of one second-order reactant, or two first-order reactants.

For a second order reaction, its reaction rate is given by:

or or

In several popular kinetics books, the definition of the rate law for second-order reactions is . Conflating the 2 inside the constant for the first, derivative, form will only make it required in the second, integrated form.

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