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Zn + 2HCl---->ZnCl2 + H2
1mol Zn-----1mol H2
3mole Zn-----xmoli H2
x=3mole H2
2.
2Al(OH)3 + 3H2SO4---->Al2(SO4)3 + 3H2O
mAl(OH)3=78u
mAl2(SO4)3=342u
2*78g Al(OH)3-----342g soli
20g Al(OH)3--------xg soli
x=20*342/156
x=43,8g Al2(SO4)3