determining n

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Alyssa Bryan 3F
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determining n

Postby Alyssa Bryan 3F » Sun Feb 24, 2019 11:42 pm

When using this equation, delta G = -nFEcell, how do you determine the value of moles (n)?

Rosha Mamita 2H
Posts: 63
Joined: Fri Sep 28, 2018 12:19 am

Re: determining n

Postby Rosha Mamita 2H » Sun Feb 24, 2019 11:46 pm

It most likely has to do with the coefficient in front of the substance used in the equation

Matthew Tran 1H
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Joined: Fri Sep 28, 2018 12:16 am

Re: determining n

Postby Matthew Tran 1H » Sun Feb 24, 2019 11:48 pm

In the equation deltaG = -nFE, n refers to the moles of electrons transferred. You can typically find this by breaking up an already balanced equation into its respective oxidation and reduction half-reactions or by balancing two known oxidation and reduction half-reactions. For example, in the Zn-Cu cell, the half reactions are: Zn --> Zn2+ + 2e- and Cu2+ + 2e- --> Cu, so there are 2 moles of electrons transferred.

Posts: 60
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Re: determining n

Postby Cameron_Greenberg_3C » Wed Feb 27, 2019 8:16 pm

It depends on the the oxidation and reduction half reactions and how many electrons are transferred. It is necessary to multiply by the correct coefficients to find the least common multiple between the two half reactions to determine the correct number of electrons that are actually transferred.

Angela Cong 3C
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Joined: Fri Sep 28, 2018 12:25 am

Re: determining n

Postby Angela Cong 3C » Wed Feb 27, 2019 9:35 pm

would there be no units for n since its just the # of moles then?

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