Ta có: \(n_{KClO_3}=\dfrac{12,25}{122,5}=0,1\left(mol\right)\)
PT: \(2KClO_3\underrightarrow{t^o}2KCl+3O_2\)
Theo PT: \(n_{KCl}=n_{KClO_3}=0,1\left(mol\right)\Rightarrow m_{KCl}=0,1.74,5=7,45\left(g\right)\)
\(n_{O_2}=\dfrac{3}{2}n_{KClO_3}=0,15\left(mol\right)\Rightarrow V_{O_2}=0,15.24,79=3,7185\left(l\right)\)