H.W. Problem 15.17


Moderators: Chem_Mod, Chem_Admin

Nandhini_2K
Posts: 60
Joined: Fri Apr 06, 2018 11:03 am

H.W. Problem 15.17

Postby Nandhini_2K » Sat Mar 16, 2019 4:29 pm

Part A asks to calculate the order for each reactant.

The solution Manuel uses experiment 2 and 3 to solve for the order with respect to B. Why can't we use experiment 1 and 2?
Attachments
IMG_3474.jpeg

sharonvivianv
Posts: 63
Joined: Fri Apr 06, 2018 11:05 am

Re: H.W. Problem 15.17

Postby sharonvivianv » Sat Mar 16, 2019 4:31 pm

Experiments 1 and 2 would help you get the order for [A] but not for [B] because the concentrations are the same in both equations.

Nandhini_2K
Posts: 60
Joined: Fri Apr 06, 2018 11:03 am

Re: H.W. Problem 15.17

Postby Nandhini_2K » Sat Mar 16, 2019 4:33 pm

Also why don't we calculate the order for reactant C?

sharonvivianv
Posts: 63
Joined: Fri Apr 06, 2018 11:05 am

Re: H.W. Problem 15.17

Postby sharonvivianv » Sat Mar 16, 2019 4:37 pm

If you look at experiments 1 and 4, you see that concentrations for C change but the initial rates are both 2. This means that C is independent of the rate.

Chem_Mod
Posts: 17238
Joined: Thu Aug 04, 2011 1:53 pm
Has upvoted: 367 times

Re: H.W. Problem 15.17

Postby Chem_Mod » Sat Mar 16, 2019 4:47 pm

In general, it's a good idea to start with the pairs of experiments where only one reactant's concentration is changing while the other concentrations are held constant. Looking at experiments 1 and 2, we see that both [A] and [C] are changing.

Hope this helps! :)

He whose name cannot be spoken
Posts: 20
Joined: Sat Apr 28, 2018 3:00 am

Re: H.W. Problem 15.17

Postby He whose name cannot be spoken » Sat Mar 16, 2019 7:14 pm

Nandhini_2K wrote:Also why don't we calculate the order for reactant C?

You can, it's just not gonna be very useful


Return to “General Rate Laws”

Who is online

Users browsing this forum: No registered users and 7 guests