Răspuns:
NaOH + HCl----> NaCl + H2O
2NaCl + H2SO4---> Na2SO4 + 2HCl
KCl + AgNO3----> AgCl + KNO3
HCl + AgNO3---> AgCl +HNO3
2KNO3---> 2KNO2+ O2
2NaHCO3---> Na2CO3+ CO2+H2O
CaCO3 + 2HCl-----> CaCL2 +H2O+ CO2
NH3+HCl====>NH4Cl
33moli:(8+2+1)parti=3mol/parte
1partex3---> 3mol Mg
2partix3=> 6 moli Cu
8partix3=24moli Al
b.
A.Mg=24g/mol A,Cu= 65g/mol A,Al= 27g/mol
m,Mg= 3x24g= 72g
m,Cu=6x65g=390g
m,Al=24x27g=648g
total 1110g
1110g....648gAl.....390gCu.....72gMg
100g...........x................y............z
x=58,4% Al
y=35,1 % Cu
z=6,5%Mg
a.
4Al + 3O2---> 2Al2O3
2Cu + O2---> 2CuO
2Mg + O2---> 2MgO