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Chemistry Forums for Students => Inorganic Chemistry Forum => Topic started by: Zezwaz on February 17, 2021, 03:32:23 PM

Title: Rate Law Question
Post by: Zezwaz on February 17, 2021, 03:32:23 PM

Hello all,
I know I did some things wrong in this problem. Could I have some help understanding where I went wrong? The numbers seem a bit too big and unwieldy to make sense in the context of the problem.
Here is the text of the problem
(https://cdn.discordapp.com/attachments/758875689247309854/811696350248566814/unknown.png)
Thank you
(https://cdn.discordapp.com/attachments/615763575088218153/811689198184038400/20210217_120238.jpg)

Title: Re: Rate Law Question
Post by: Orcio_87 on March 21, 2021, 04:57:14 PM

I think that this reaction cannot give FO and ClO as products !!!!

Experiments 2 and 3 show that with equal concentration of CF₂Cl₂ reaction speed is proportional to concentration of O₃ (it drops with the same rate).

Experiments 1 and 4 give us information about dependence of rate vs. concentration of CF₂Cl₂ (according to my calculations it is V ~ [CF₂Cl₂]³).

Here is the problem, as this data gives conflicted results about rate constant (different constant for experiment 1 and 4, and different for 2 and 3).

I don't know is it error in this test or did I went wrong ???

Title: Re: Rate Law Question
Post by: mjc123 on March 22, 2021, 06:44:12 AM

I can't see your attachment.
The equation isn't balanced, so it must be wrong.
The data are inconsistent. Experiments 2, 3 and 4 are consistent with rate ≈ 10[O₂][CF₂Cl₂], but experiment 1 is not. I don't think this question can be answered.

Title: Re: Rate Law Question
Post by: Orcio_87 on March 22, 2021, 02:28:47 PM

Quote

Experiments 2, 3 and 4 are consistent with rate ≈ 10[O2][CF2Cl2]

I think that this answer would be too easy.

But you are right. Is it V = k [O₃] x [CF₂Cl₂] or V = k [O₃] x [CF₂Cl₂]³, presented data are wrong.