$*)ancol don chuc:\begin{cases}C_nH_mOH \\ m\leq 2n+1\end{cases}$ $2C_nH_mOH+(\frac{4n+m-1}{2})O_2\rightarrow 2nCO_2+(m+1)H_2O$
$*)ancol no mach ho:$
$C_nH_{2n+2-m}(OH)_m\overset{+O_2}{\rightarrow}nCO_2+(n+1)H_2O$
$*)ancol da chuc:\begin{cases}C_nH_m(OH)_t \\ 2n+2\geq m+t\end{cases}$
$C_nH_m(OH)_t\overset{+O_2}{\rightarrow}nCO_2+(\frac{m+t}{2})H_2O$
$\Rightarrow n_{ancol}=n_{H_2O}-n_{CO_2}\Leftrightarrow ancol no mach ho$