\(2KMnO4-->K2MnO4+MNO2+O2\)
\(n_{O2}=\frac{3,36}{22,4}=0,15\left(mol\right)\)
\(n_{KMnO4}=2n_{O2}=0,3\left(mol\right)\)
\(m_{KMnO4}=0,3.158=47,4\left(g\right)\)
\(n_{O2}=\frac{3,36}{22,4}=0,15\left(mol\right)\)
\(2KMnO_4\rightarrow K_2MnO_4+MnO_2+O_2\)
\(n_{KMnO4}=2n_{O2}=2.0,15=0,3\left(mol\right)\)
\(\Rightarrow m_{KMnO4}=0,3.158=47,4\left(g\right)\)