a. \(n_{Fe}=\dfrac{16.8}{56}=0,3\left(mol\right)\)
\(n_{O_2}=\dfrac{128}{32}=4\left(mol\right)\)
PTHH : 3Fe + 2O2 -> Fe3O4
0,3 0,2 0,1
Xét tỉ lệ : \(\dfrac{0.3}{3}< \dfrac{4}{2}\) => Fe đủ , O2 dư
\(m_{O_2\left(dư\right)}=\left(4-0,2\right).32=121,6\left(g\right)\)
b. \(m_{Fe_3O_4}=0,1.232=23,2\left(g\right)\)
c. \(V_{O_2}=0,2.22,4=4,48\left(l\right)\)
d. \(V_{kk}=4,48.5=22,4\left(l\right)\)