## Unique Rate of A Reaction

rachelmackenzie3H
Posts: 10
Joined: Fri Jul 22, 2016 3:00 am

### Unique Rate of A Reaction

I see that 15.3 asks about the rate of the reaction in respect to different reactants. However, what do they mean when they refer to the unique rate of the reaction?

trase aguigam 2A
Posts: 10
Joined: Fri Jul 15, 2016 3:00 am
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### Re: Unique Rate of A Reaction

Hello!

As I recall, a unique rate is the rate of the appearance/disappearance of any of the species in a reaction divided by its corresponding stoichiometric coefficient.

Shirley_Zhang 3O
Posts: 35
Joined: Wed Sep 21, 2016 2:56 pm

### Re: Unique Rate of A Reaction

Some students asked the same question couple years ago, and here is what Dr. Lavelle posted back then:

"A unique rate is a rate of appearance/disappearance of any of the species in a reaction divided by its stoichiometric coefficient. A unique rate will be the same for each reactant or product."

So basically, if the reaction A+2B ---> 3C with a unique rate of 2, then the rate of "A" disappearing is 2, the rate of B disappearing is 4 because the stoichiometric coefficient of B, 2, times the unique rate, 2, equals 4, and the rate of C forming is 6 because the stoichiometric coefficient of C, 3, times the unique rate, 2, equals 6.

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