2. mFe2O3=20.60/100=12g=>nFe2O3=0,075mol
mCuO=20-12=8g=>nCuO=0,1mol
CuO+H2->Cu+H2O
0,1.....0,1
Fe2O3+3H2->2Fe+3H2O
0,075....0,225
nH2pứ=0,225+0,1=0,325mol
3.
mFe=60,5.46,289/100=28g=>nFe=0,5mol
mZn=60,5-28=32,5g=>nZn=0,5mol
Fe+2HCl->FeCl2+H2
0,5..1........0,5........0,5
Zn+2HCl->ZnCl2+H2...