2) 

nH2 = 6.72/22.4 = 0.3 (mol) 

Fe2O3 + 3H2 -to-> 2Fe + 3H2O 

0.1______0.3______0.2

mFe2O3 = 0.1*160 = 16 (g) 

mFe = 0.2*56 = 11.2 (g) 

3) 

nFe3O4 = 11.6/232 = 0.05 (mol) 

3Fe + 2O2 -to-> Fe3O4 

0.15___0.1______0.05 

mFe = 0.15*56 = 8.4 (g) 

VO2 = 0.1*22.4 = 2.24 (l) 

2KClO3 -to-> 2KCl + 3O2

1/15______________0.1 

mKClO3 = 1/15 * 122.5 = 8.167 (g) 

a)

3H2 + Fe2O3  --t^o--> 2Fe + 3H2O

b) nH2 = 6,72/22,4 = 0,3 mol

Từ pt => nFe3O4 = 0,1 mol

=> mFe3O4 = 0,1. 232 = 23,2 g

1.

a) 3H2 + Fe2O3  --t^o--> 2Fe + 3H2O

b) nH2 = 6,72/22,4 = 0,3 mol

Từ pt => nFe3O4 = 0,1 mol

=> mFe3O4 = 0,1. 232 = 23,2 g

c) nFe = 0,2 mol

=> mFe = 0,2 . 56 = 11,2 (g)

Phương trình hóa học của phản ứng:

Fe2O3 + 3H2 → 2Fe + 3H2O.

Khử 1 mol Fe2O3 cho 2 mol Fe.

x mol Fe2O3 → 0,2 mol.

x = 0,2 : 2 =0,1 mol.

m = 0,1 .160 =16g.

Khử 1 mol Fe2O3 cần 3 mol H2.

Vậy khử 0,1 mol Fe2O3 cần 0,3 mol H2.

V= 0,3 .22.4 = 6,72l.

nFe=0,2(mol)

a) PTHH: Fe2O3 + 3 H2 -to-> 2 Fe + 3 H2O

0,1_____________0,3____0,2(mol)

b) mFe2O3=160.0,1=16(g)

c) V(H2,đktc)=0,3.22,4=6,72(l)

nFe = 11.2/56 = 0.2 (mol) 

FeO + H2 -to-> Fe + H2O 

0.2.....0.2...........0.2

mFeO = 0.2*72 = 14.4 (g) 

VH2 = 0.2*22.4 = 4.48 (l) 

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

b, \(n_{Fe}=\dfrac{24}{56}=\dfrac{3}{7}\left(mol\right)\)

Theo PT: \(n_{Fe_2O_3}=\dfrac{1}{2}n_{Fe}=\dfrac{3}{14}\left(mol\right)\Rightarrow m_{Fe_2O_3}=\dfrac{3}{14}.160=\dfrac{240}{7}\left(g\right)\)

c, Theo PT: \(n_{H_2}=\dfrac{3}{2}n_{Fe}=\dfrac{9}{14}\left(mol\right)\Rightarrow V_{H_2}=\dfrac{9}{14}.22,4=14,4\left(l\right)\)

\(n_{Fe}=\dfrac{m}{M}=\dfrac{24}{56}\approx0,43\left(mol\right)\\ a.PTHH:Fe_2O_3+3H_2\underrightarrow{t^o}2Fe+3H_2O\)  

                     2             3         2          3

                   0,43      0,645   0,45     0,645

\(b.m_{Fe_2O_3}=n.M=0,43.\left(56.2+16.3\right)=68,8\left(g\right)\\ c.V_{H_2}=n.24,79=0,645.24,79=15,98955\left(l\right).\)

a)\(PTHH:Fe_3O_4+4H_2\xrightarrow[]{}3Fe+4H_2O\)

b)\(m_{Fe}=\dfrac{24}{56}=0,4\left(m\right)\)

\(PTHH:Fe_3O_4+4H_2\xrightarrow[]{}3Fe+4H_2O\)

tỉ lệ       :1              4           3         4

số mol  :0,13         0,53       0,4     0,53

\(m_{Fe_3O_4}=0,13.232=30,16\left(g\right)\)

c)\(V_{H_2}=0,53.22,4=11,872\left(l\right)\)

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

b, \(n_{Fe}=\dfrac{11,2}{56}=0,2\left(mol\right)\)

Theo PT: \(n_{Fe_3O_4}=\dfrac{1}{3}n_{Fe}=\dfrac{1}{15}\left(mol\right)\Rightarrow m_{Fe_3O_4}=\dfrac{1}{15}.232=\dfrac{232}{15}\left(g\right)\)

c, \(n_{H_2}=\dfrac{4}{3}n_{Fe}=\dfrac{4}{15}\left(mol\right)\Rightarrow V_{H_2}=\dfrac{4}{15}.22,4=\dfrac{448}{75}\left(l\right)\)

d, \(Zn+2HCl\rightarrow ZnCl_2+H_2\)

\(n_{Zn}=n_{H_2}=\dfrac{4}{15}\left(mol\right)\Rightarrow m_{Zn}=\dfrac{4}{15}.65=\dfrac{52}{3}\left(g\right)\)

\(n_{HCl}=2n_{H_2}=\dfrac{8}{15}\left(mol\right)\Rightarrow m_{HCl}=\dfrac{8}{15}.36,5=\dfrac{292}{15}\left(g\right)\)

\(n_{Fe}=\dfrac{11,2}{56}=0,2\left(mol\right)\)

\(PTHH:Fe_2O_3+3H_2\xrightarrow[]{}2Fe+3H_2O\)

tỉ lệ          :1              3          2         3

số mol     :0,1           0,3       0,2      0,3

\(m_{Fe_2O_3}=0,1.160=16\left(g\right)\)

\(n_{Fe}=\dfrac{11,2}{56}=0,2\left(mol\right)\)

\(Fe_2O_3+3H_2\xrightarrow[]{t^\circ}2Fe+3H_2O\uparrow\)

  0,1          ←       0,2

\(\Rightarrow m_{Fe_2O_3}=0,1\cdot160=16\left(g\right)\)

\(n_{Fe}=\dfrac{11,2}{56}=0,2\left(mol\right)\)

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

Theo PT: \(n_{Fe_2O_3}=\dfrac{1}{2}n_{Fe}=0,1\left(mol\right)\Rightarrow m_{Fe_2O_3}=0,1.160=16\left(g\right)\)

Fe2O3+3H2-to>2Fe+3H2O

0,1125---0,3375----0,225 mol

n Fe=0,225 mol

=>m Fe2O3=0,1125.160=18g

=>VH2=0,3375.22,4=7,56l

a,\(n_{Fe}=\dfrac{12,6}{56}=0,225\left(mol\right)\)

PTHH: 3H₂ + Fe₂O₃ ---t^o---> 2Fe + 3H₂O

Mol:   0,3375  0,1125

\(m_{Fe_2O_3}=0,1125.160=18\left(g\right)\)

b, \(V0,3375.22,4=7,56\left(l\right)\)