Moles of electrons?

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aisteles1G
Posts: 117
Joined: Fri Sep 28, 2018 12:15 am

Moles of electrons?

Postby aisteles1G » Tue Feb 26, 2019 5:35 pm

How do you determine n (number of moles of electrons) by simply looking at a redox rxn to us the equation G=-nFE? Or do you have to write out and balance the whole thing? Thanks!

Gary Qiao 1D
Posts: 66
Joined: Fri Sep 28, 2018 12:26 am

Re: Moles of electrons?

Postby Gary Qiao 1D » Tue Feb 26, 2019 5:40 pm

I usually did balance out the half reactions in order to determine the n. If there are any other ways, I would be glad to know too!

Nicole Lee 4E
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Re: Moles of electrons?

Postby Nicole Lee 4E » Tue Feb 26, 2019 7:18 pm

I usually balance out the half reactions. If the redox rxn that is given is balanced, you only need to balance one of the half reactions to see how many moles of electrons you need.

Karishma_1G
Posts: 67
Joined: Fri Sep 28, 2018 12:18 am

Re: Moles of electrons?

Postby Karishma_1G » Tue Feb 26, 2019 8:11 pm

I also usually balance the half reactions in order to see how many electrons need to be exchanged in order for them to cancel when you add the two half reactions together.

805087225
Posts: 30
Joined: Thu Jun 07, 2018 3:00 am

Re: Moles of electrons?

Postby 805087225 » Tue Feb 26, 2019 8:28 pm

The only way of knowing n is by balancing the half reactions - so, that the electrons lost and gained tally.

Subhani Diu 1F
Posts: 16
Joined: Fri Sep 28, 2018 12:20 am

Re: Moles of electrons?

Postby Subhani Diu 1F » Tue Feb 26, 2019 9:36 pm

It helps to balance out the half reactions to see how many moles of electrons are gained/lost.

Ian Marquez 2K
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Re: Moles of electrons?

Postby Ian Marquez 2K » Tue Feb 26, 2019 10:36 pm

Like stated above, if the redox reaction that is given is already balanced, you can just look at either half-reaction to see how many electrons cancel out since everything is already properly balanced.


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