July 14, 2020, 08:21:39 AM
Forum Rules: Read This Before Posting

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

0 Members and 1 Guest are viewing this topic.

Offline nokia8650

  • Regular Member
  • ***
  • Posts: 19
  • 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!


Offline Yggdrasil

  • Retired Staff
  • Sr. Member
  • *
  • Posts: 3211
  • Mole Snacks: +482/-21
  • Gender: Male
  • 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.

Sponsored Links