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Question

Eocell for reaction,
4Al(s)+3O2(s)+6H2O+4OH4[Al(OH)4] is 2.73 V.
If Gof for OH and H2O are - 157 kJ mol1 and - 237.2 kJ mol1. If Gof for [Al(OH)4] is x kJ.
x is:

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Solution

For given cell reaction,

ΔGo=nEoF

ΔGo=12×2.73×96500J

=3.1613×103kJ

[n=124Alo4Al3++12e3Oo2+12e6O2]

Now for given reactions,

ΔGo=4×Gof[Al(OH)4]6×Gof[H2O]4×Gof[OH]

(Also note that Gof for elements is zero)
3.1613×103=4×Gof[Al(OH)4]6×(237.2)4×(157)

Gof[Al(OH)4]=1303kJ

x=1303

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