which formula do i use to solve for the rate constant of a 2nd order half life?

4 answers

(1/A) - (1/Ao) = akt
what does the small a stand for?
a is a whole number, usually 1 or 2; sometimes but rarely 3.
For simple equations in which
A ==> B, the formula is just .... = kt
For 2A ==> B it is .....= 2kt
For 3A ==> B is is ..... = 3kt etc.
Thank you!