electron per mol

[joonkimdds]

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3Co(2+) + 2Cr ==> 2Cr(3+) + 3Co
when I use the equation delta G = -nFE
-n represents number of electrons.
the n is 6 here. But I don't know how it's 6.



How many seconds will it take to produce 11.2 liters of
Cl2(g), measured at STP, by electrolysis of molten NaCl
with a 12 amp current? (F = 96500 C/mol)

In this 2nd problem, the solution says there are 2 moles of electrons per 1 mol of Cl2. I don't know how they found it out.


NiSO4 ==> Ni(2+) + SO4(2-)
in this case, I know that 2 mols of electrons per 1 mole of Ni because Ni is (2+)charged and thus requires 2 electrons to make it neutral. But I don't understand the first two.

 

[FuzzyChicken]

Question #1:
n = 6 since its the # of electrons transferred * # of moles so,
looking at Co --> (2e- transferred)*(3mol) = 6 or
looking at Cr --> (3e- transferred)*(2mol) = 6

Question #2:
I think they are referring to the following chemical equations:
NaCl --> Na + Cl
and
Cl2 --> 2Cl

so, for Cl2 there are 2 moles of e- per Cl