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determining n

Posted: Sun Feb 24, 2019 11:42 pm
by Alyssa Bryan 3F
When using this equation, delta G = -nFEcell, how do you determine the value of moles (n)?

Re: determining n

Posted: Sun Feb 24, 2019 11:46 pm
by Rosha Mamita 2H
It most likely has to do with the coefficient in front of the substance used in the equation

Re: determining n

Posted: Sun Feb 24, 2019 11:48 pm
by Matthew Tran 1H
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.

Re: determining n

Posted: Wed Feb 27, 2019 8:16 pm
by Cameron_Greenberg_3C
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.

Re: determining n

Posted: Wed Feb 27, 2019 9:35 pm
by Angela Cong 3C
would there be no units for n since its just the # of moles then?