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![](https://rs.olm.vn/images/avt/0.png?1311)
Ta có: \(n_{Fe}=\dfrac{35}{56}=0,625\left(mol\right)\)
PT: \(Fe_2O_3+3H_2\underrightarrow{t^o}2Fe+3H_2O\)
Theo PT: \(n_{H_2}=\dfrac{3}{2}n_{Fe}=0,9375\left(mol\right)\)
\(\Rightarrow V_{H_2}=0,9375.22,4=21\left(l\right)\)
PT: \(Fe_2O_3+3CO\underrightarrow{t^o}2Fe+3CO_2\)
Theo PT: \(n_{CO}=\dfrac{3}{2}n_{Fe}=0,9375\left(mol\right)\)
\(\Rightarrow V_{CO}=0,9375.22,4=21\left(l\right)\)
![](https://rs.olm.vn/images/avt/0.png?1311)
Theo pt: n H 2 = n C u O = 0,375 mol
V H 2 = n H 2 .22,4 = 0,375.22,4 = 8,4(l)
→ Chọn A.
![](https://rs.olm.vn/images/avt/0.png?1311)
PTHH: \(Fe_2O_3+3H_2\underrightarrow{t^o}2Fe+3H_2O\)
a+b) \(n_{Fe}=\dfrac{22,4}{56}=0,4\left(mol\right)\)
\(\Rightarrow\left\{{}\begin{matrix}n_{Fe_2O_3}=0,2\left(mol\right)\\n_{H_2}=0,6\left(mol\right)\end{matrix}\right.\) \(\Rightarrow\left\{{}\begin{matrix}m_{Fe_2O_3}=0,2\cdot160=32\left(g\right)\\V_{H_2}=0,6\cdot22,4=13,44\left(l\right)\end{matrix}\right.\)
c) PTHH: \(Zn+H_2SO_4\rightarrow ZnSO_4+H_2\uparrow\)
Theo PTHH: \(n_{Zn}=n_{H_2}=0,6\left(mol\right)\)
\(\Rightarrow m_{Zn}=0,6\cdot65=39\left(g\right)\)
a,
nFe = 22,4/56 = 0,4 (mol)
PTHH
Fe2O3 + 3H2 ---to----) 2Fe + 3H2O (1)
theo phương trình (1) ,ta có:
nFe2O3 = 0,4 x 2 / 1 = 0,8 (mol)
mFe2O3 = 160 x 0,8 = 128 (g)
b,
theo pt (1)
nH2 = (0,4 x 3)/2 = 0,6 (mol)
=) VH2 = 0,6 x 22,4 = 13,44 (L)
c,
PTHH
Zn + H2SO4 -------------) ZnSO4 + H2 (2)
Số mol H2 cần dùng là 0,6 (mol)
Theo PT (2) :
nZn = nH2 ==) nZn = 0,6 x 65 = 39 (g)
![](https://rs.olm.vn/images/avt/0.png?1311)
Fe2O3+3H2-to>2Fe+3H2O
0,05-----0,15------0,1
CuO+H2-to>Cu+H2O
0,05---0,05-----0,05
ta có CuOchiếm 33,3%
=> m CuO=12.\(\dfrac{33,3}{100}\)= 4g
=>n CuO=\(\dfrac{4}{80}\)=0,05 mol
=>m Fe2O3=12-4=8g
->n Fe2O3=\(\dfrac{8}{160}\)=0,05 mol
=>VH2= 0,2.22,4=4,48l
=>m Y=0,1.56+0,05.64=8,8g
![](https://rs.olm.vn/images/avt/0.png?1311)
\(a,n_{Fe_2O_3}=\dfrac{8}{160}=0,05\left(mol\right)\\ PTHH:Fe_2O_3+3H_2\underrightarrow{t^o}2Fe+3H_2O\\ Mol:0,05\rightarrow0,15\rightarrow0,1\\ m_{Fe}=0,1.56=5,6\left(g\right)\\ b,V_{H_2}=0,15.22,4=3,36\left(l\right)\\ c,n_{O_2}=\dfrac{1,12}{22,4}=0,05\left(mol\right)\\ \\ PTHH:3Fe+2O_2\underrightarrow{t^o}Fe_3O_4\\ LTL:\dfrac{0,1}{3}>\dfrac{0,05}{2}\Rightarrow Fe.dư\\ n_{Fe_3O_4}=\dfrac{0,05}{2}=0,025\left(mol\right)\\ m_{Fe_3O_4}=0,025.232=5,8\left(g\right)\)
nFe2O3 = 8 : 160 = 0,05 (mol)
pthh: Fe2O3 + 3H2 -t--> 2Fe + 3H2O
0,05--------0,15----->0,1 (mol)
=> VH2= 0,15 . 22,4 = 3,36 (L)
=> mFe = 0,1 . 56 = 5,6 (g)
nO2 = 1,12 : 22,4 = 0,05 (mol)
pthh : 2H2+ O2 -t-> 2H2O
LTL :
0,15/2 > 0,05/1
=> H2 du
theo pt , nH2O = 2 nO2 = 0,1 (mol)
=> mH2O = 0,1 .18 = 1,8 (g)
Chọn D