Ta có: \(n_{O_2}=\dfrac{67,2}{22,4}=3\left(mol\right)\)
PT: \(2KMnO_4\underrightarrow{t^o}K_2MnO_4+MnO_2+O_2\)
______6_________________________3 (mol)
\(\Rightarrow m_{KMnO_4}=6.158=948\left(g\right)\)
PT: \(2KClO_3\xrightarrow[MnO_2]{t^o}2KCl+3O_2\)
______2_________________3 (mol)
\(\Rightarrow m_{KClO_3}=2.122,5=245\left(g\right)\)