\(m_{O_2}=12,25-8,41=3,84\left(g\right)\Rightarrow n_{O_2}=\dfrac{3,84}{32}=0,12\left(mol\right)\)
PTHH: \(2KClO_3\underrightarrow{t^o}2KCl+3O_2\)
0,08<----0,08<-0,12
=> Y chứa \(\left\{{}\begin{matrix}KCl:0,08.74,5=5,96\left(g\right)\\KClO_3:12,25-0,08.122,5=2,45\left(g\right)\end{matrix}\right.\)
\(H\%=\dfrac{m_{KClO_3\left(pư\right)}}{m_{KClO_3\left(bđ\right)}}.100\%=\dfrac{0,08.122,5}{12,25}.100\%=80\%\)