Chemical Kinetics Query

  • #1
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Main Question or Discussion Point

HI

While working on some chemical kinetics problems, I came across the statement, the fraction of activated molecules is [itex]10^{-15}[/itex] in a problem where some other constants were also provided and the half life was to be found (for a first order reaction). My specific query is:

Is this fraction equal to the probability factor in the Arrhenius Equation? That is, is this equal to P where

[tex]k = APe^{-E_{act}/RT}[/tex]

where k = rate constant, A = frequency factor, P = probability factor, [itex]E_{act}[/itex] = activation energy and T = absolute temperature?

Or is it something else?

Thanks and cheers
vivek
 
Last edited:

Answers and Replies

  • #2
GCT
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It'll be better for you if you were to post the exact problem instead of having us guess around (not to sound rude).
 
  • #3
Gokul43201
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The fraction of activated molecules is actually the exponential term.

A and P are related to collision rates (T dependent) and molecular geometries (steric effects).
 
  • #4
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Thanks Gokul, you were right about the exponential term.

Cheers
vivek
 

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