Unique Rate

104922499 1F · Postby **104922499 1F** » Sat Mar 03, 2018 12:13 pm

Can someone clarify what unique rate laws are? I did not understand what Lavelle said during class about this. Thanks!

Sabrina Dunbar 1I · Postby **Sabrina Dunbar 1I** » Sat Mar 03, 2018 12:49 pm

The unique rate is the instantaneous rate of change at any time t during the reaction. Unlike the average rate, which takes into account all of the times at which the reaction proceeds and averages it, the instantaneous rate is specific to a time and therefore it generates a different k value. The general equation used for the unique rate can be written as rate=d[R]/dt while the average rate is rate=∆concentration/∆t. Unique rate laws are specific to each reaction and are confined to a specific time.

Alvin Tran 2E · Postby **Alvin Tran 2E** » Sat Mar 03, 2018 1:37 pm

In addition, when you calculate the unique rate, it is the same for all the reactants and products involved in the reaction.

Angela G 2K · Postby **Angela G 2K** » Sat Mar 03, 2018 2:37 pm

For a reaction aA + bB -> cC + dD, where the lowercase letters are the stoichiometric coefficients and the uppercase letters are chemical species, the unique rate law is
$-\frac{1}{a}\frac{d[A]}{dt} = -\frac{1}{b}\frac{d[B]}{dt} = \frac{1}{c}\frac{d[C]}{dt} = \frac{1}{d}\frac{d[D]}{dt}$

This rate law is unique to the reaction and the same for all reactants and products in this reaction.

104922499 1F · Postby **104922499 1F** » Thu Mar 15, 2018 8:14 pm

thanks!

Connie2I · Postby **Connie2I** » Sat Mar 17, 2018 1:09 am

Is there a way to know when exactly we should be using unique rate?

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