a) 3Fe + 2O2 \(\underrightarrow{to}\) Fe3O4 (1)
\(n_{Fe}=\dfrac{16,8}{56}=0,3\left(mol\right)\)
Theo PT1: \(n_{O_2}=\dfrac{2}{3}n_{Fe}=\dfrac{2}{3}\times0,3=0,2\left(mol\right)\)
\(\Rightarrow V_{O_2}=0,2\times22,4=4,48\left(l\right)\)
\(\Rightarrow V_{KK}=\dfrac{4,48}{20\%}=22,4\left(l\right)\)
b) 2KMnO4 \(\underrightarrow{to}\) K2MnO4 + MnO2 + O2 (2)
Theo PT2: \(n_{KMnO_4}=2n_{O_2}=2\times0,2=0,4\left(mol\right)\)
\(\Rightarrow m_{KMnO_4}=0,4\times158=63,2\left(g\right)\)
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