\(Zn+2HCl\rightarrow ZnCl_2+H_2\)
\(ZnO+2HCl\rightarrow ZnCl_2+H_2O\)
a. \(n_{H2}=0,2\rightarrow n_{Zn}=n_{H2}=0,2\left(mol\right)\)
\(\rightarrow\%m_{Zn}=\frac{0,2.65}{21,1}=61,61\%\)
\(\%m_{ZnO}=38,39\%\)
b. \(m_{Zn}=0,2.65=13\rightarrow m_{ZnO}=8,1\rightarrow n_{ZnO}=0,1\)
\(\rightarrow n_{ZnCl2}=n_{Zn}+n_{ZnO}=0,3\left(mol\right)\)
\(\rightarrow m_{ZnCl_2}=40,8\left(g\right)\)