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K(-): Na⁺ + 1e⁻ --> Na
A(+): 2Cl⁻ --> Cl₂ + 2e⁻
23g --------- 96500C
200g ------- x
x = 839130C
I = q/t zatem t = q/I
t = 839130C/20A = 41956,5s ≈11,65h