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V=25cm2*0,001cm=0,025cm3
Jej masa(miedzi) m=V*d
m=0,025cm3*9g/cm3=0,225g
K: Cu(2+) +2e----->Cu(0)
2*96500 C(kulomb)------64g Cu
x C-----------------------0,225g Cu
x=678,52 C
Q=i*t
t=Q/i
t=678,52/0,5
t=1357 sekund
t=22min 37s