a) CuO + 2HCl ⟶CuCl2 + 2H2O
6HCl + Fe2O3 → 2FeCl3 + 3H2O
Gọi x, y lần lượt là số mol CuO, Fe2O3
\(\left\{{}\begin{matrix}80x+160y=16\\135x+162,5.2y=29,75\end{matrix}\right.\)
=> \(\left\{{}\begin{matrix}x=0,1\\y=0,05\end{matrix}\right.\)
=> \(\%m_{CuO}=\dfrac{0,1.80}{16}.100=50\%\)
\(\%m_{Fe_2O_3}=100-50=50\%\)
b) \(n_{HCl}=2n_{CuO}+6n_{Fe_2O_3}=0,5\left(mol\right)\)
=> \(CM_{HCl}=\dfrac{0,3}{0,1}=3M\)