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4g h2 - xg zn
2-65
x= 130g Zn
potrzeba 130 g Zn
mH=1u
Zn + 2HCl---->ZnCl2 + H2
65g Zn--------2g wodoru
xg Zn---------4g wodoru
x=65*4/2
x=130g Zn