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### Topic: Units of arrhenius' equation  (Read 36159 times)

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#### nokia8650

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• Mole Snacks: +0/-0 ##### Units of arrhenius' equation
« on: February 05, 2008, 01:55:42 PM »
In arrhenius' equation, given the units of the rate constant, how does onework out the units of A, the frequency factor?  Ea is in J/Mol, R is in J/K/Mol, and T is in K.

Also, please can you give an example of finding the units of A!

Thanks

#### Yggdrasil

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• Gender: • Physical Biochemist ##### Re: Units of arrhenius' equation
« Reply #1 on: February 05, 2008, 08:36:05 PM »
Arrhenius' equation states that:

k = Ae-Ea/RT

Note that Ea has units of energy and RT also has units of energy, so the exponential is a dimensionless quantity.  This means that A has the same units as k.  The units of k depend on the particular rate law of the reaction you're studying.