\(2H_2+O_2\rightarrow\left(t^o\right)2H_2O\)
Giả sử có 1 mol O2 => nH2 = 2mol
\(2KMnO_4\rightarrow\left(t^o\right)K_2MnO_4+MnO_2+O_2\)
2 1 ( mol )
\(m_{KMnO_4}=158.2=316g\)
\(Zn+2HCl\rightarrow ZnCl_2+H_2\)
2 2 ( mol )
\(m_{Zn}=65.2=130g\)
\(\dfrac{m_{KMnO_4}}{m_{Zn}}=\dfrac{316}{130}=\dfrac{158}{65}\)