$C_2H_5OH+[O]\rightarrow CH_3CHO+H_2O$ $x x$
$C_2H_5OH+2[O]\rightarrow CH_3COOH+H_2O$
$y y y$
$C_2H_5OH_{du}+Na\rightarrow C_2H_5ONa+0,5H_2\uparrow$
$z 0,5z$
$CH_3COOH+Na\rightarrow CH_3COONa+0,5H_2\uparrow$
$y 0,5y$
$H_2O + Na\rightarrow NaOH + H_2\uparrow$
$(x+y) 0,5(x+y)$
$\Rightarrow \begin{cases}\frac{y}{x+y+z}=\frac{25}{100} \\ 0,5(x+2y+z)=\frac{5,6}{22,4}\\46(x+y+z)=m \end{cases}\Rightarrow \begin{cases}x+z=3y \\ x+2y+z=0,5\\46(x+y+z)=m \end{cases}\Rightarrow \begin{cases}x+z=0,3 \\ y=0,1\\46(x+y+z)=m \end{cases}$
$\Rightarrow m=46.0,4=18,4 gam$