$*)hh:\begin{cases}V_{H_2O}=600 ml \\ V_{CO_2}=600 ml\\V_{O_2 du}=100 ml \end{cases}\Rightarrow V_{O_2 pu}=800 ml$ $C_xH_yO_z+(x+0,25y-0,5z)O_2\rightarrow xCO_2+0,5yH_2O$
$200 800 600 600$
$\Rightarrow 1:(x+0,25y-0,5z):x:0,5y=200:800:600:600$
$\Rightarrow \begin{cases}x=3 \\ y=6\\z=1 \end{cases}\Rightarrow C_3H_6O$