\(n_{Fe} =\dfrac{5,6}{56} = 0,1(mol)\\ 3Fe + 2O_2 \xrightarrow{t^o} Fe_3O_4\)
Theo PTHH :
\(n_{O_2} = \dfrac{2}{3}n_{Fe} = \dfrac{1}{15}mol\\ V_{O_2} = \dfrac{1}{15}.22,4 = 1,493(lít)\)
\(n_{Fe_3O_4} = \dfrac{1}{3}n_{Fe} = \dfrac{1}{30}mol\\ m_{Sắt\ từ} = \dfrac{1}{30}.232 = 7,73(gam)\)
nFe = 5,6\56= 0,1 mol
3Fe + 2O2 → Fe3O4
0,1mol→0,06mol→0,03mol
⇒VO2 = 0,06 . 22,4 =1,344(l)
⇒mFe3O4 = 0.03 . 232 = 6,96g
PTHH: 3 Fe + 2 O2 -to-> Fe3O4
nFe=0,1(mol) -> nO2= 1/15(mol); nFe3O4= 1/30(mol)
mFe3O4= 1/30 x 232 \(\approx\) 7,733(g)
V(O2,đktc)= 22,4 x 1/15\(\approx\) 1,493(l)