a)CuO +2HCl--->CuCl2 +H2O
x----------2x
Fe2O3 +6HCl---->2FeCl3 +3H2O
y-----------6y
b) Gọi n\(_{Cu}=x\Rightarrow m_{Cu}=80x\)
n\(_{Fe2O3}=y\Rightarrow m_{Fe2O3}=160y\)
Suy ra 80x+160y=12(*)
Mặt khác
n\(_{HCl}=0,2,2=0,4\left(mol\right)\)
Theo pthh ta có hệ pt
\(\left\{{}\begin{matrix}80x+56y=12\\2x+6y=0,4\end{matrix}\right.\Rightarrow\left\{{}\begin{matrix}x=0,05\\y=0,05\end{matrix}\right.\)
=> m\(_{CuO}=80.0,05=4\left(g\right)\)
m\(_{Fe2O3}=12-4=8\left(g\right)\)
c) Theo pthh1
n\(_{CuCl2}=n_{Cu}=0,05\left(mol\right)\)
CM(CuCl2) =\(\frac{0,05}{0,2}=0,25\left(M\right)\)
Theo pthh2
n\(_{FeCl2}=2n_{Fe2o3}=0,1\left(mol\right)\)
C\(_{M\left(FeCl3\right)}=\frac{0,1}{0,2}=0,5\left(M\right)\)
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