1)2Al+6H2O=2Al(OH)3+3H2
2Al2O3=4Al+3H2O
2Al+6HCl=2AlCl3+3H2O
2)2Al+6HCl=2AlCl3+3H2
2-------------------------3
n(H2)=7.4:22.4=0.33 моль
2------3
x------0.33 х=0.33*2:3=0.22 моль
m(Al)=0.22*27=6 г
12-6=6 г меди
12---100%
6-------х
х=49.5% Меди и 49.5% алюминия
3)Al(OH)3+3HCl=AlCl3+3H2O
Al(OH)3+3NaOH=Na3AlO3+3H2O
4)NH3+HCl=NH4Cl
(NH4)2SO4+BaCl2=2NH4Cl+BaSO4
NH4OH+HCl=NH4Cl+H2O
5)Al2(SO4)3+H2O=2Al(OH)3+3H2SO4
2Al+3SO4+H2O=2AL(OH)3+6H+3SO4
2Al+H2O=2AL(OH)3+6H
AlCl3+3H2O=Al(OH)3+3HCl
Al+3Cl+3H2O=Al(OH)3+3H+3Cl
Al+3H2O=Al(OH)3+3H
6)AlCl3+3KOH=3KCl+Al(OH)3
1--------------------------------1
n(AlCl3)=30:132=0.23=n(Al(OH)3)
M(AlCl3)=132
M(Al(OH)3)=78
m(Al(OH)3)=78*0.23=17.73г