Shelly D.

asked • 12/11/21

problem number 2

Problem 2: What is the complete rate law equation for the overall reaction described by the elementary equations seen below. Assume that the rate constant for the overall reaction is 1400 mol L-1 min-1. Explain (using only words) how you would use the elementary reactions to create the equation without doing any math.


J.R. S.

tutor
Shelly, I think there's a mistake in the elementary steps because they don't add up and they don't balance. Please check them again to be sure you have copied everything correctly.
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12/11/21

1 Expert Answer

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JACQUES D. answered • 12/11/21

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Your first reaction is wonky. If the overall reaction is CHCl3 + Cl2 --> CCl4 + HCl , you only need the two later reactions added. If so, only the slow reaction matters if there is sufficient Cl2 . In that case the overall rate constant will depend on k2PCHCl3PCl2 and not with the square of chlorine partial pressure as might be expected from the overall reaction.


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J.R. S.

tutor
Cl2 is an intermediate and as such should not appear in the rate equation? What are your thoughts on that?
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12/12/21

JACQUES D.

tutor
In the overall reaction that I proposed, Cl2 is not an intermediate. The first reaction student gave isn't anything, so I gave a hypothetical.
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12/12/21

Shelly D.

so what is the complete rate law equation for the overall reaction?
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01/08/22

JACQUES D.

tutor
I stated the rate law based on the equations that I assumed. The first equation is not right, so my answer was meant to be illustrative.
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01/08/22

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