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22,4dm³ wodoru --- 2g
10dm³ wodoru ------ xg
x = 0,89g
z=2
m=0,89g
M=2g
F=96500C
I=2A
t=m*z*F/M*I
t=0,89*2*96500/2*2
t=171770/4
t = 42942,5s
t = 11h 56min
t ≈ 12h