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Chemistry Forums for Students => High School Chemistry Forum => Topic started by: jayjay112 on April 19, 2009, 05:17:51 PM

Title: How to determine number of moles of electrons transferred in a reaction?
Post by: jayjay112 on April 19, 2009, 05:17:51 PM
Hi,

please see my question at...http://www.flickr.com/photos/37144556@N07/3456365719/sizes/o/

G' = -nF. E'
G' = -RT. ln k

G' = (-8.314 x 298)( ln k )

0.32 = [(-8.314 x 298)( ln k )] / [(n) (96500)]

and then

(0.32).(n).(96500) / (-8.314 x 298) = ln k

but what is n (the number moles of elctrons transferred in the reaction )

is it 2?? because of the 2+???

Title: Re: How to determine number of moles of electrons transferred in a reaction?
Post by: lancenti on April 20, 2009, 10:25:49 PM
It's not part of the question, so you don't have to actually answer it but I'm guessing you're curious.

To answer your question, you simply need to construct the balanced half-equations. Either the Reduction or Oxidation Half-equation will be sufficient.

Title: Re: How to determine number of moles of electrons transferred in a reaction?
Post by: jayjay112 on April 23, 2009, 12:48:56 PM
but do i not need "n" to solve for k??
Title: Re: How to determine number of moles of electrons transferred in a reaction?
Post by: leve on April 23, 2009, 01:44:09 PM
but what is n (the number moles of elctrons transferred in the reaction )

is it 2?? because of the 2+???[/b]

The charge does not necessarily mean the number of electrons. What are the reduction and oxidation reactions? Since you have your overall reaction in the question, how many moles of electrons are required to produce that reaction?
Title: Re: How to determine number of moles of electrons transferred in a reaction?
Post by: jayjay112 on April 24, 2009, 03:04:53 PM

Since you have your overall reaction in the question, how many moles of electrons are required to produce that reaction?

Thats the part  i dont know???
Title: Re: How to determine number of moles of electrons transferred in a reaction?
Post by: leve on April 24, 2009, 03:12:01 PM
What are the reduction and oxidation reactions?
Title: Re: How to determine number of moles of electrons transferred in a reaction?
Post by: jayjay112 on April 24, 2009, 03:22:44 PM
What are the reduction and oxidation reactions?

ok i dont know how to write them, ( ill learn) ..but when i learn how to what do i do?
Title: Re: How to determine number of moles of electrons transferred in a reaction?
Post by: leve on April 24, 2009, 03:27:16 PM
n is the number of electrons needed for the reaction. Balance both the reduction and oxidation reactions such that your overall reaction is the one in the question and the number of electrons canceled out is n.
Title: Re: How to determine number of moles of electrons transferred in a reaction?
Post by: jayjay112 on April 24, 2009, 03:38:02 PM
thank you