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K: Ag+ + e ---> Ag
A: 2H2O ---> 4H+ + O2 +4e
W=e x mol e
mol e= w x muatan Ag : Ar Ag
= 21,6 × 1 : 108
=0,2
dianoda ada 4mol e sedang O2 ada 1 jadi 1/4×0,2=0,05 mol
ubah mol menjadi liter
L=mol x 22,4
=0,05 x 22,4 = 1,12