PT: \(S+O_2\underrightarrow{t^o}SO_2\)
\(n_S=\dfrac{6,4}{32}=0,2\left(mol\right)\)
a, \(n_{O_2}=n_S=0,2\left(mol\right)\Rightarrow V_{O_2}=0,2.22,4=4,48\left(l\right)\)
b, \(2KMnO_4\underrightarrow{t^o}K_2MnO_4+MnO_2+O_2\)
\(n_{KMnO_4}=2n_{O_2}=0,4\left(mol\right)\Rightarrow m_{KMnO_4}=0,2.158=31,6\left(g\right)\)