a. \(n_{Fe}=\frac{33,6}{56}=0,6\left(mol\right)\)
\(3Fe+2O_2\rightarrow Fe_3O_4\)
Theo PTHH: \(n_{O_2}=\frac{2}{3}n_{Fe}=\frac{2}{3}.0,6=0,4\left(mol\right)\)
\(\Rightarrow V_{O_2}=0,4.22,4=8,96\left(l\right)\)
\(\Rightarrow V_{kk}=8,96:20\%=44,8\left(l\right)\)
b. \(n_P=\frac{2,48}{31}=0,08\left(mol\right)\)
\(4P+5O_2\rightarrow2P_2O_5\)
Theo PTHH: \(n_{O_2}=\frac{5}{4}n_P=\frac{5}{4}.0,08=0,1\left(mol\right)\)
\(\Rightarrow V_{O_2}=0,1.22,4=2,24\left(l\right)\)
\(\Rightarrow V_{kk}=2,24:20\%=11,2\left(l\right)\)
