PTHH: CuO+H2to→Cu+H2OCuO+H2→toCu+H2O (1)
FexOy+yH2→toxFe+yH2OFexOy+yH2→toxFe+yH2O (2)
Fe+2HCl→FeCl2+H2↑Fe+2HCl→FeCl2+H2↑ (3)
a) Ta có: nH2(3)=0,89622,4=0,04(mol)=nFenH2(3)=0,89622,4=0,04(mol)=nFe ⇒nCu=3,52−0,04⋅5664=0,02(mol)=nCuO⇒nCu=3,52−0,04⋅5664=0,02(mol)=nCuO
⇒{mCuO=0,02⋅80=1,6(g)mFexOy=4,8−1,6=3,2(g)⇒{mCuO=0,02⋅80=1,6(g)mFexOy=4,8−1,6=3,2(g)
b) Theo PTHH: nFexOy=0,04x=3,256x+16ynFexOy=0,04x=3,256x+16y
⇒0,96x=0,64y⇒0,96x=0,64y ⇒xy=23⇒xy=23
Vậy CTPT cần tìm là Fe2O3