The rate law for the 2nd order reaction of the type *A + 2B* → *P* is:

Using the same logic described in the previous article, we can rewrite the rate law as:

where *a* = [*A _{0}*] and

*b*= [

*B*].

_{0}Rearranging the above equation and integrating throughout, we have

Substituting the partial fraction expression in eq13 and after some algebra, we have,

which is equivalent to