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n HCl = 0,25dm3*2,01mol/dm3=0,5025mol
1mol - 36,5g
0,5025 - x
x=18,34g
2 HCl -> H2 + 2 Cl-
73 - 2
18,43 - x
x=0,5g
Odp: powstanie 0,5 g wodoru