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A(+): 2H2O->4H^(+)+4e+O2
q=I*t, I=5A, t=1h=3600s
q=5*3600=18000c
wiec :
4*96500C/mol-22,4dm3/mol
18000c - x
x=(22,4*18000)/(4*96500)=1,045dm3