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A(+): 2H2O->4H^(+)+4e+O2
V=100cm3, Cm=0,05, M=160g/mol
n=Cm*V
n=ms/M
ms/M=Cm*V
ms=Cm*V*M=0,05*100*160=5*160=800mg=0,8g
M1=64g/mol
1mol e=96500C/mol
64g/mol-2*96500C/mol
0,8g - q
q=(0,8*2*96500)/64=(1,6*96500)/64=0,025*96500=2412,5C
q=I*t, I=0,5A
t=q/I=2412,5/0,5=4825s=80,4167min=1,34godziny