First Order Reaction Half Life Equation at Life

First Order Reaction Half Life Equation. At half life of reaction, t = t ½ & [a] = [a] o /2. Notice how it takes the same amount of time for the concentration to decrease between points.

To calculate half life period of first order reaction, you need rate constant (k). T ½ = 1 / k [a o] top. As the half life is always constant for a first order process, then the rate constant of the reaction can be related to the half life by a simple equation:

Halflife of a firstorder reaction Chemistry

Half life period of first order reaction is the time required for 50 percent completion of the reaction is calculated using half_life = ln (2)/ rate constant. T 1 /2 = 0.693/k. T (1/2)= [a]° / 2k. Graphical relations and half lives;