Unique Rate of A Reaction

[rachelmackenzie3H]

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]

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]

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.