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Topic: determining the number of moles  (Read 3838 times)

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pharm_chick

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determining the number of moles
« on: December 07, 2005, 08:09:01 PM »
ok, I have a question, In a redox reaction, how do you calculate the number of moles of electrons transfered?
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Offline Bakegaku

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Re:determining the number of moles
« Reply #1 on: December 07, 2005, 09:20:58 PM »
You'd calculate it by multiplying the numbers of moles being reduced by the amounts it's being reduced to.

If an oxygen atom is reduced to an oxygen ion (O-2) then there would be two moles of electrons being transferred per one mole of oxygen atoms.  

I hope this example is understandable.
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pharm_chick

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Re:determining the number of moles
« Reply #2 on: December 08, 2005, 02:53:13 PM »
so if you have C_2_ that is being oxidized and it goes from a -2 charge to a +2 charge how many electrons are being transfered? What about if you have Cr_2_  that is being oxidized and it goes from a +6 charge to a 0 charge? what if you have both in the same reaction?
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Offline Bakegaku

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Re:determining the number of moles
« Reply #3 on: December 08, 2005, 07:35:19 PM »
Well by how much did the charge change?  If it went from -2 to +2 then it means it has lost 4 electrons.  That means there's a transfer of 4 electrons/C atoms.  

So you should be able to figure out the same for Cr.
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"True knowledge exists in knowing that you know nothing"
-Socrates

"I see, I forget.  I hear, I remember.  I do, I understand"
-Confucius

"Nothing will benefit human health and increase chances for survival of life on Earth as much as the evolution to a vegetarian diet."
- Albert Einstein?

"American cartoons place characters in situations; anime
places situations around characters.  Anime characters
are not like fictional characters but more like fictional
people; their actions stem directly from their personalities,
and not just as a means to move the story's plot
forward.  We are made to sympathize with them, and
not simply be entertained by them."
~John Oppliger~
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