Gọi \(\left\{{}\begin{matrix}n_{Zn}:x\left(mol\right)\\n_{Al}:y\left(mol\right)\end{matrix}\right.\)
\(n_{O2}=\frac{5,6}{22,4}=0,25\left(mol\right)\)
\(2Zn+O_2\rightarrow2ZnO\)
x_____x/2_______
\(4Al+3O_2\rightarrow2Al_2O_3\)
y___3y/4______
Giải hệ PT:
\(\left\{{}\begin{matrix}65x+27y=18,4\\\frac{x}{2}+\frac{3y}{4}=0,25\end{matrix}\right.\Rightarrow\left\{{}\begin{matrix}x=0,2\\y=0,22\end{matrix}\right.\)
\(\%m_{Zn}=\frac{0,2.65}{18,4}.100\%=70,65\%\)
\(\Rightarrow\%m_{Al}=100\%-70,65\%=29,35\%\)
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