\(n_{Fe}=\dfrac{16,8}{56}=0,3\left(mol\right)\)
\(n_{O_2}=\dfrac{8,96}{22,4}=0,4\left(mol\right)\)
Pt; \(3Fe+2O_2\underrightarrow{t^o}Fe_3O_4\)
0,3 0,4
Lập tỉ số: \(n_{Fe}:n_{O_2}=0,1< 0,2\)
Fe hết, O2 dư
\(n_{O_2\left(dư\right)}=0,4-0,2=0,2\left(mol\right)\)
\(m_{O_2\left(dư\right)}=0,2.32=6,4\left(g\right)\)
\(n_{Fe_3O_4}=\dfrac{0,3.1}{3}=0,1\left(mol\right)\)
\(m_{Fe_3O_4}=0,1.232=23,2\left(g\right)\)