### half lives

Posted:

**Wed Feb 17, 2016 1:44 pm**The decomposition of SO2Cl2 has a rate constant of 1.42x10^-4 s^-1 at a certain temperature and has a half

life which is independent of the initial concentration.

(a) How long will it take for the concentration of SO2Cl2 to decrease to 25% of its initial concentration?

t1/2= 0.693/k

so then 0.693/1.42x10^-4 s^-1 =4.88x10^-3 s^-1

(b) How long will it take for the concentration of SO2Cl2 to decrease to 25% of its initial concentration?

- why is it that for 25% of the initial concentration you take 2 half lives? Wouldn't two half lives equal the full reaction? thus decreasing the concentration to 0? Could someone help me sharpen this concept?

how does it change for 50%, 25%, 12:5%? Thank you so much!

life which is independent of the initial concentration.

(a) How long will it take for the concentration of SO2Cl2 to decrease to 25% of its initial concentration?

t1/2= 0.693/k

so then 0.693/1.42x10^-4 s^-1 =4.88x10^-3 s^-1

(b) How long will it take for the concentration of SO2Cl2 to decrease to 25% of its initial concentration?

- why is it that for 25% of the initial concentration you take 2 half lives? Wouldn't two half lives equal the full reaction? thus decreasing the concentration to 0? Could someone help me sharpen this concept?

how does it change for 50%, 25%, 12:5%? Thank you so much!