15.35 homework


Moderators: Chem_Mod, Chem_Admin

Samira 2B
Posts: 38
Joined: Fri Sep 29, 2017 7:05 am

15.35 homework

Postby Samira 2B » Sun Mar 04, 2018 11:50 am

Why can't we use the same trick that was used in 27 to determine the half-lives for the times that are multiples of 2?

Samira 2B
Posts: 38
Joined: Fri Sep 29, 2017 7:05 am

Re: 15.35 homework

Postby Samira 2B » Sun Mar 04, 2018 11:54 am

Also, I used a ratio instead of the actual values given and I got the wrong answer? Why is that?

Dylan Davisson 2B
Posts: 50
Joined: Thu Jul 27, 2017 3:00 am
Been upvoted: 2 times

Re: 15.35 homework

Postby Dylan Davisson 2B » Sun Mar 04, 2018 12:07 pm

You cannot use the ratio alone to solve for the half-lives of a second order reaction, because the half life of a second order reaction is not dependent only on the rate constant, but also on initial concentration ([A]0). 15.27 deals with the half life of a first order reaction, so it is only dependent on the rate constant, and that is why multiplying it by the ratio works. For 15.35, you must take into account the initial concentrations of the reactants as well as the rate constant in order to get the right answer.


Return to “Second Order Reactions”

Who is online

Users browsing this forum: No registered users and 2 guests