5)
a) Zn + 2HCl => ZnCl2 + H2
b) CuO + H2 -to-> Cu + H2O
c) FeO + H2 -to-> Fe + H2O
d) 2Al + 3H2SO4 => Al2(SO4)3 + 3H2
e) Fe + CuSO4 => FeSO4 + Cu
f) 2KClO3 -to-> 2KCl + 3O2
9)
%Al = 27.nAl/7.5 * 100% = 36%
=> nAl = 0.1 mol
mMg = 4.8 g
nMg = 0.2 mol
nH2 = 1.5*0.1 + 0.2 = 0.35 mol
VH2 = 7.84 (l)
Vote hay nhất nhé <3