Ta có: \(n_{HCl}=\dfrac{175.14,6\%}{36,5}=0,7\left(mol\right)\)
PT: \(CuO+2HCl\rightarrow CuCl_2+H_2O\)
\(Fe_2O_3+6HCl\rightarrow2FeCl_3+3H_2O\)
Gọi: \(\left\{{}\begin{matrix}n_{CuO}=x\left(mol\right)\\n_{Fe_2O_3}=y\left(mol\right)\end{matrix}\right.\)
⇒ 80x + 160y = 20 (1)
Theo PT: \(n_{HCl}=2n_{CuO}+6n_{Fe_2O_3}=2x+6y=0,7\left(2\right)\)
Từ (1) và (2) \(\Rightarrow\left\{{}\begin{matrix}x=0,05\left(mol\right)\\y=0,1\left(mol\right)\end{matrix}\right.\)
\(\Rightarrow\left\{{}\begin{matrix}\%m_{CuO}=\dfrac{0,05.80}{20}.100\%=20\%\\\%m_{Fe_2O_3}=80\%\end{matrix}\right.\)