\(n_{Fe_3O_4}=\dfrac{m}{M}=\dfrac{23,2}{56.3+16.4}=\dfrac{23.2}{232}=0,1\left(mol\right)\)
\(Fe_3O_4+4CO\xrightarrow[t^o]{}3Fe+4CO_2\)
1 : 4 : 3 : 4
\(0,1\rightarrow0,4\rightarrow0,3\rightarrow0,4\left(mol\right)\)
\(V_{CO}=n.22,4=0,4.22,4=8,96\left(l\right)\)
b) \(m_{Fe}=n.M=0,3.56=16,8\left(g\right)\)