Ta có:
\(n_{Fe}=\frac{6,8}{56}=12\left(mol\right)\)
\(Fe_xO_y+yH_2\rightarrow xFe+yH_2O\)
\(Fe_xO_y+2yHCl\rightarrow xFeCl_{\frac{2y}{x}}+yH_2O\)
\(2C_nH_{2n+1}OH+2Na\rightarrow2C_nH_{2n+1}ONa+H_2\)
\(n_{H2}=\frac{1,12}{22,4}=0,05\left(mol\right)\Rightarrow n_{hh}=0,1\left(mol\right)\)
\(\Rightarrow M_{hh}=\frac{3,9}{0,1}=39\left(\frac{g}{mol}\right)\)
\(\Leftrightarrow14n+18=39\Leftrightarrow n=1,5\)
Gọi \(\left\{{}\begin{matrix}n_{CH3OH}:x\left(mol\right)\\n_{C2H5OH}:y\left(mol\right)\end{matrix}\right.\)
Giải hệ PT:
\(\left\{{}\begin{matrix}32x+46y=3,9\\x+y=0,1\end{matrix}\right.\Rightarrow\left\{{}\begin{matrix}x=0,05\\y=0,05\end{matrix}\right.\)
\(\Rightarrow\left\{{}\begin{matrix}\%m_{CH3OH}=\frac{0,05.32}{3,9}.100\%=41,03\%\\\%m_{C2H5OH}=100\%-41,03\%=58,97\%\end{matrix}\right.\)