a,PTHH:
\(Fe_2O_3+6HCl\rightarrow2FeCl_3+3H_2O\)
x 6x 2x 3x
\(ZnO+2HCl\rightarrow ZnCl_2+H_2O\)
y 2y y y
\(\left\{{}\begin{matrix}160x+81y=16,1\\325x+136y=29,85\end{matrix}\right.\)
\(\Leftrightarrow x=0,05;y=0,1\)
b,\(\%m_{Fe_2O_3}=\dfrac{0,05.160}{16,1}.100\%=49,69\%\)
\(\%m_{ZnO}=100\%-49,69=50,31\%\)
c, \(C_{M\left(HCl\right)}=\dfrac{0,5}{0,3}=\dfrac{5}{3}\left(M\right)\)