R3.2.14 Cell potential and Gibbs free energy (HL)

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This video covers how to calculate Gibbs's energy from Ecell.
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at 1:22 - for calculating the cell potential of the reaction wouldn't we have to use the reverse reaction for zinc ions being reduced into zinc atoms, so +0.76 - (+0.15) = 0.61 instead of 1.1 volts?

heleen
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if u see for example that 3Ag+ transfer their electrons to Al to form Al3+, can we assume that n=3 without balancing the half equaions for e-

god
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If the units of the variables in the equation G = -nFE are n: mol, F: C/mol, E: J/C (volts) then how does G have a unit of J/mol? Shouldn't it have a unit of only J? Is it more conceptual as in joules per every mole of Zn and Cu that react?

nicole
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