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Final Winter 2013

Posted: Sat Mar 17, 2018 9:57 pm
by camrynpatterson3C
Question 4 about the droplets assumes that the number of moles is 4. How do we know this??

Re: Final Winter 2013

Posted: Sat Mar 17, 2018 10:03 pm
by Christiana2D
The number 4 is the moles of electrons being transferred in the reaction. This number can be determined by looking at the number of electrons present in the half reactions, or by looking at the oxidation numbers of the reactants and products. For the products the Iron has a plus 4 charge and the OH minus combined has a -4 charge.

Re: Final Winter 2013

Posted: Sat Mar 17, 2018 10:08 pm
by ZoeHahn1J
We know n=4 because that's the number of moles of electrons transferred when Fe is oxidized and O2 is reduced - split the reaction into two half reactions to check.

Re: Final Winter 2013

Posted: Sat Mar 17, 2018 10:46 pm
by Jason Muljadi 2C
Can't you also tell because there is (OH)2 meaning that there will be 4e-'s due to the charge of O always being 2- and there's 2 of them?