Gọi \(\left\{{}\begin{matrix}n_{Fe2O3}:x\left(mol\right)\\n_{CuO}:y\left(mol\right)\end{matrix}\right.\)
\(Fe_2O_3+3CO\rightarrow2Fe+3CO_2\)
\(CuO+CO\rightarrow Cu+CO_2\)
\(160x+80y=24\)
\(n_{O\left(bi.khu\right)}=3n_{Fe2O3\left(pư\right)}+n_{CuO\left(pư\right)}=3x.80\%+y.80\%=\frac{24-18,88}{16}=0,32\left(mol\right)\)
\(\Rightarrow x=y=0,1\)
\(\Rightarrow\left\{{}\begin{matrix}\%m_{Fe2O3}=\frac{160x}{24}=66,67\%\\\%m_{CuO}=100\%-66,67\%=33,33\%\end{matrix}\right.\)