$C+O2=CO2 S +O2=SO2 $$x mol b mol$
$\begin{cases}x+y=0,5 \\ 12x+32y=12 \end{cases}\Rightarrow \begin{cases}x=0,2 \\ y=0,3 \end{cases}\Rightarrow mC=2,4g\Rightarrow $%$C=20$%, %$S=80$%
$M hon hop=\frac{12}{0,5}=24\Rightarrow ti khoi cua G so vs H2=12$