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H.W. Problem 15.17

Posted: Sat Mar 16, 2019 4:29 pm
by Nandhini_2K
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?

Re: H.W. Problem 15.17

Posted: Sat Mar 16, 2019 4:31 pm
by sharonvivianv
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.

Re: H.W. Problem 15.17

Posted: Sat Mar 16, 2019 4:33 pm
by Nandhini_2K
Also why don't we calculate the order for reactant C?

Re: H.W. Problem 15.17

Posted: Sat Mar 16, 2019 4:37 pm
by sharonvivianv
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.

Re: H.W. Problem 15.17

Posted: Sat Mar 16, 2019 4:47 pm
by Chem_Mod
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! :)

Re: H.W. Problem 15.17

Posted: Sat Mar 16, 2019 7:14 pm
by He whose name cannot be spoken
Nandhini_2K wrote:Also why don't we calculate the order for reactant C?

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