CuO+H2SO4→CuSO4+H2O
a a a
FeO+H2SO4→FeSO4+H2O
b b b
Al2O3+3H2SO4→Al2(SO4)3+3H2O
c 3c c
Gọi nCuO=a, nFeO=b, nAl2O3=c
80a+72b+102c=6,1
a+b+3c=0,13
CuSO4+2NaOH→Cu(OH)2+Na2SO4
a a
FeSO4+2NaOH→Fe(OH)2+Na2SO4
b b
6NaOH+Al2(SO4)3→3Na2SO4+2Al(OH)3
Al(OH)3+NaOH→NaAlO2+2H2O
Cu(OH)2→CuO+H2O
a a
4Fe(OH)2+O2→2Fe2O3+4H2O
b 0,5b
80a+80b=3,2
→a+b=0,04
→3c=0,13-0,04=0,09
→c=0,03
→80a+72b+102c=6,1
→80a+72b=3,04
→a=0,02
b=0,02
mCuO=0,02.80=1,6g
mFeO=0,02.72=1,44g
mAl2O3=0,03.102=3,06g