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A(+): 2Cl^(-)->Cl2+2e
I=2A, t=0,5h=1800s,M=118,71g/mol
q=I*t=2*1800=3600c
wiec :
2*96500/mol-118,71g/mol
3600c-x
x=(3600*118,71)/(2*96500)=2,214g