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K (-) : Al3+ + 3e -----> Al
A (+) 2O2- ------> O2 + 4e
G = 8 x 100 x 60 x 27/ 96500 x 3 = 4,48 gram
2Al2O3 -----> 4Al + 3O2
n.Al = 4,48/27 = 0,166 mol
n.O2 = 3/4 x 0,166 = 0,1244 mol
V.O2 = 0,1244 x 22,4 = 2,79 L