a)\(2Zn+O2-->2ZnO\)
x----------------------------x(mol)
\(2Mg+O2-->2MgO\)
y------------------------y(mol
Theo bài ta có hpt
\(\left\{{}\begin{matrix}65x+24y=5,34\\81x+40y=7,26\end{matrix}\right.\Rightarrow\left\{{}\begin{matrix}x=0,06\\y=0,06\end{matrix}\right.\)
\(\%m_{Zn}=\frac{0,06.65}{5,34}.100\%=73,03\%\)
\(\%m_{Mg}=100-73,03=26,97\%\)
b)\(3Zn+O3-->3ZnO\)
0,06----0,02(mol)
\(3Mg+O2-->3MgO\)
0,06----0,02(mol)
\(\sum n_{O3}=0,04\left(mol\right)\)
\(V_{O3}=0,04.22,4=0,896\left(l\right)\)