nH2 = 6,62/22,4 = 0,3 (mol)
nFe3O4 = 46,4/232 = 0,2 (mol)
PTHH: Fe3O4 + 4H2 -> (t°) 3Fe + 4H2O
LTL: 0,2 > 0,3/4 => Fe3O4 dư
nFe = 0,3 : 4 . 3 = 0,225 (mol)
mFe = 0,225 . 56 = 12,6 (g)
\(n_{H_2}=\dfrac{6,72}{22,4}=0,3\left(mol\right)\)
\(n_{Fe_3O_4}=\dfrac{46.4}{232}=0,2\left(mol\right)\)
PTHH : 4H2 + Fe3O4 -> 3Fe + 4H2O
0,3 0,225
Xét tỉ lệ \(\dfrac{0,3}{4}< \dfrac{0,2}{1}\) => Fe3O4 dư , H2 đủ
\(m_{Fe}=0,225.56=12,6\left(g\right)\)
4H2+Fe3O4-to>3Fe+4H2O
0,3---------------------0,225 mol
n H2=\(\dfrac{6,72}{22,4}\)=0,3 mol
n Fe3O4=\(\dfrac{46,4}{232}\)=0,2 mol
=>Fe3O4 dư
=>m Fe=0,225.56=12,6g