FeO+H2-to>Fe+H2O

0,1------0,1----0,1

n FeO=0,1 mol

=>VH2=0,1.22,4=2,24l

=>m Fe=0,1.56=5,6g

tách nhỏ nhé

8

4Al+3O2-to>2al2O3

0,2----0,15-------0,1

n O2=0,15 mol

=>m AL2o3=0,1.102=10,2g

10

4H2+Fe3O4->3Fe+4H2O

0,8-----0,2--------0,6

n Fe3O4=0,2 mol

=>m Fe=0,6.56=33,6g

=>VH2=0,8.22,4=17,92l

\(n_{Fe_2O_3}=\dfrac{14.4}{160}=0.09\left(mol\right)\)

\(Fe_2O_3+3H_2\underrightarrow{^{t^0}}2Fe+3H_2O\)

\(0.09.........0.27...0.18\)

\(V_{H_2}=0.27\cdot22.4=6.048\left(l\right)\)

\(m_{Fe}=0.18\cdot56=10.08\left(g\right)\)

PTHH: \(FeO+H_2\longrightarrow Fe+H_2O\)

a/ \(n_{FeO}=\dfrac{m_{FeO}}{M_{FeO}}=\dfrac{14,4}{72}=0,2(mol)\)

\(\to n_{H_2}=0,2(mol)\)

\(\to V_{H_2}=0,2.22,4=4,48(l)\)

b/ \(n_{Fe}=n_{H_2}=0,2(mol)\)

\(\to m_{Fe}=0,2.56=11,2(g)\)

n F e 2 O 3 = 14.4 160 = 0.09 ( m o l ) F e 2 O 3 + 3 H 2 t 0 → 2 F e + 3 H 2 O 0.09.........0.27...0.18 V H 2 = 0.27 ⋅ 22.4 = 6.048 ( l ) m F e = 0.18 ⋅ 56 = 10.08 ( g )

\(n_{Fe_2O_3}=\dfrac{16}{160}=0,1\left(mol\right)\\ Fe_2O_3+3H_2\rightarrow2Fe+3H_2O\\ n_{H_2}=3.0,1=0,3\left(mol\right)\\ a.V_{H_2\left(đktc\right)}=0,3.22,4=6,72\left(l\right)\\ b.m_{Fe}=0,2.\left(100\%-5\%\right).56=10,64\left(g\right)\)

\(a) Zn + 2HCl \to ZnCl_2 + H_2\\ b) n_{H_2} = n_{Zn} = \dfrac{6,5}{65} = 0,1(mol)\\ V_{H_2} = 0,1.22,4 = 2,24(lít)\\ c) n_{Fe_2O_3} = \dfrac{3,2}{160} = 0,02(mol)\\ Fe_2O_3 + 3H_2 \xrightarrow{t^o} 2Fe + 3H_2O\\ 3n_{Fe_2O_3} = 0,02.3 = 0,06 < n_{H_2} = 0,1 \to H_2\ dư\)

Vậy lượng sắt III oxit trên phản ứng hết với lượng hidro sinh ra.

a) PTPƯ:        Zn     +    2 HCl   →    Zn\(_{ }Cl_2\)  +   \(_{_{ }}H_2\)

\(_{ }n_{Zn}\) = \(\dfrac{6,5}{65}\) = 0,1 ( mol)

Theo PTPƯ: để có 1 mol \(_{_{ }}H_2\) cần 1 mol  Zn

     ⇒   có 0,1 mol Zn sẽ tạo ra 0,1 mol \(_{_{ }}H_2\) 

\(_{ }V_{H_2}\) =  n. 22,4 = 0,1 . 22,4 = 2,24 ( l)

c) 

PTPƯ: 3 \(_{ }H_2\)     +       \(_{ }Fe_2O_3\)    →      3 \(_{ }H_2O\)  +     2Fe

tỉ lệ:          3         :         1              :          3         :      2 

Số mol:   0,1        :        \(\dfrac{1}{30}\)

\(_{ }m_{Fe_2O_3}\) = \(\dfrac{1}{30}\) . 160 =  5,3 ( g)

a, \(FeO+H_2\underrightarrow{t^o}Fe+H_2O\)

b, \(n_{FeO}=\dfrac{7,2}{72}=0,1\left(mol\right)\)

\(n_{Fe}=n_{FeO}=0,1\left(mol\right)\Rightarrow m_{Fe}=0,1.56=5,6\left(g\right)\)

c, \(n_{H_2}=n_{FeO}=0,1\left(mol\right)\Rightarrow V_{H_2}=0,1.22,4=2,24\left(l\right)\)

a, \(Fe+2HCl\rightarrow FeCl_2+H_2\)

b, \(n_{Fe}=\dfrac{3,36}{56}=0,06\left(mol\right)\)

Theo PT: \(n_{H_2}=n_{Fe}=0,06\left(mol\right)\Rightarrow V_{H_2}=0,06.22,4=1,344\left(l\right)\)

c, \(n_{Fe_2O_3}=\dfrac{4}{160}=0,025\left(mol\right)\)

PT: \(Fe_2O_3+3H_2\underrightarrow{t^o}2Fe+3H_2O\)

Xét tỉ lệ: \(\dfrac{0,025}{1}>\dfrac{0,06}{3}\), ta được Fe₂O₃ dư.

Theo PT: \(n_{Fe_2O_3\left(pư\right)}=\dfrac{1}{3}n_{H_2}=0,02\left(mol\right)\Rightarrow n_{Fe_2O_3\left(dư\right)}=0,025-0,02=0,005\left(mol\right)\)

\(\Rightarrow m_{Fe_2O_3\left(dư\right)}=0,005.160=0,8\left(g\right)\)

a, \(n_{Ca}=\dfrac{12}{40}=0,3\left(mol\right)\)

PT: \(Ca+2H_2O\rightarrow Ca\left(OH\right)_2+H_2\)

Theo PT: \(n_{H_2}=n_{Ca}=0,3\left(mol\right)\Rightarrow V_{H_2}=0,3.22,4=6,72\left(l\right)\)

b, \(n_{Ca\left(OH\right)_2}=n_{Ca}=0,3\left(mol\right)\Rightarrow m_{Ca\left(OH\right)_2}=0,2.74=22,2\left(g\right)\)

c, \(n_{Fe_3O_4}=\dfrac{8,4}{232}=\dfrac{21}{580}\left(mol\right)\)

PT: \(Fe_3O_4+4H_2\underrightarrow{t^o}3Fe+4H_2O\)

Xét tỉ lệ: \(\dfrac{\dfrac{21}{580}}{1}< \dfrac{0,3}{4}\), ta được H₂ dư.

Theo PT: \(n_{Fe}=3n_{Fe_3O_4}=\dfrac{63}{580}\left(mol\right)\Rightarrow m_{cr}=m_{Fe}=\dfrac{63}{580}.56=\dfrac{882}{145}\left(g\right)\)