\(m_{CuO}=50.20\%=10\left(g\right)\)

\(n_{CuO}=\dfrac{10}{80}=0,125\left(mol\right)\)

\(m_{Fe_2O_3}=50-10=40\left(g\right)\)

\(n_{Fe_2O_3}=\dfrac{40}{160}=0,25\left(mol\right)\)

PTHH :

  \(CuO+H_2\underrightarrow{t^o}Cu+H_2O\)

0,125   0,125   0,125 

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

0,25        0,75    0,5 

\(a,V_{H_2}=\left(0,75+0,125\right).22,4=19,6\left(l\right)\)

\(b,m_{Cu}=0,125.64=8\left(g\right)\)

\(m_{Fe}=0,5.56=28\left(g\right)\)

mFe2O3=80%.50=40(g)

=>nFe2O3=40/160=0,25(mol)

mCuO=50-40=10(g)

=>nCuO=10/80=0,125(mol)

Fe2O3+3H2--t*-->2Fe+3H2O

0,75____0,75

CuO+H2--t*-->Cu+H2O

0,125__0,125

ΣH2=ΣH2=0,75+0,125=0,875(mol)

=>VH2=0,875.22,4=19,6(l)

từ đó bạn suy ra =>

3Fe + 2O₂ --to> Fe₃O₄                            4Al + 3O₂    -to-> 2Al₂O₃

x ---------------> x/3                           y------------------> y/2

Theo đề bài\(\dfrac{\dfrac{x.232}{3}+\dfrac{y.102}{2}}{56x+27y}=\dfrac{283}{195}\)

Giải pt => x = 3y 

=> %mFe =\(\dfrac{3y.56}{3y.56+27y}100=\) 86,15%

<=> %mAl = 100 - 86,15 = 13,85%

\(n_{Cu}=\dfrac{19,2}{64}=0,3mol\)

\(Fe_2O_3+3H_2\rightarrow\left(t^o\right)2Fe+3H_2O\)

\(CuO+H_2\rightarrow\left(t^o\right)Cu+H_2O\)

 0,3                         0,3               ( mol )

\(m_{CuO}=0,3.80=24g\)

\(\Rightarrow m_{Fe_2O_3}=40-24=16g\)

\(\%m_{CuO}=\dfrac{24}{40}.100=60\%\)

\(\%m_{Fe_2O_3}=100\%-60\%=40\%\)

\(n_{Cu}=\dfrac{19,2}{64}=0,3mol\)

\(CuO+H_2\rightarrow Cu+H_2O\)

0,3                  0,3

\(\Rightarrow n_{CuO}=0,3\Rightarrow m_{CuO}=24g\)

\(\Rightarrow m_{Fe_2O_3}=40-24=16g\Rightarrow n_{Fe_2O_3}=0,1mol\)

\(Fe_2O_3+3H_2\rightarrow2Fe+3H_2O\)

\(\%m_{CuO}=\dfrac{24}{40}\cdot100\%=60\%\)

\(\%m_{Fe_2O_3}=100\%-60\%=40\%\)

\(Fe_2O_3 + 3H_2 \xrightarrow{t^o} 2Fe + 3H_2O\\ CuO + H_2 \xrightarrow{t^o} Cu + H_2O\\ \text{Theo PTHH : } n_{H_2} = n_{H_2O} = \dfrac{9}{18} = 0,5(mol)\\ \text{Bảo toàn khối lượng : } m_{Oxit} + m_{H_2} = m_{kim\ loại} + m_{H_2O}\\ \Rightarrow m_{kim\ loại} = 32 + 0,5.2 - 9 = 24(gam)\)

\(n_{H_2O}=n_{H_2}=\dfrac{9}{18}=0.5\left(mol\right)\)

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

\(CuO+H_2\underrightarrow{t^0}Cu+H_2O\)

\(BTKL:\)

\(m_{oxit}+m_{H_2}=m_{kl}+m_{H_2O}\)

\(\Rightarrow m_{kl}=32+0.5\cdot2-0.5\cdot18=24\left(g\right)\)

PT: Fe2O3+3H2to→2Fe+3H2O

CuO+H2to→Cu+H2O

a, Ta có:  mFe2O3=20.60%=12(g)

⇒nFe2O3=\(\dfrac{12}{160}\)=0,075(mol

mCuO=20−12=8(g

⇒nCuO=\(\dfrac{8}{80}\)=0,1(mol)

Theo pT: 

nFe=2nFe2O3=0,15(mol)

nCu=nCuO=0,1(mol)

⇒mFe=0,15.56=8,4(g)

mCu=0,1.64=6,4(g)

b, Theo PT: nH2=3nFe2O3+nCuO=0,325(mol)

⇒VH2=0,325.22,4=7,28(l)

c. Zn+2HCl->ZnCl2+H2

               0,65----------0,325

=>m HCl=0,65.36,5=23,725g

Ủa bạn cái câu a . 20x60% ( 20 ở đâu vậy bạn

3Fe + 2O₂ --> Fe₃O₄                            4Al + 3O₂    --> 2Al₂O₃

x ---------------> x/3                           y------------------> y/2

Theo đề bài \(\dfrac{\dfrac{x.232}{3}+\dfrac{y.102}{2}}{56x+27y}\) = \(\dfrac{283}{195}\)

Giải pt => x = 3y 

=> %mFe = \(\dfrac{mFe}{mFe+mAl}.100\%\)= \(\dfrac{3y.56}{3y.56+27y}.100\%\) = 86,15%

<=> %mAl = 100 - 86,15 = 13,85%

Gọi số mol Fe₃O₄, PbO là a, b

=> 232a + 223b= 78,95

PTHH: Fe₃O₄ + 4H₂ --t^o--> 3Fe + 4H₂O

               a------>4a---------->3a

             PbO + H₂ --t^o--> Pb + H₂O

                b--->b--------->b

=> 56.3a + 207.b = 68,55

=> a = 0,1; b = 0,25

=> \(\left\{{}\begin{matrix}\%Fe_3O_4=\dfrac{232.0,1}{78,95}.100\%=29,386\%\\\%PbO=\dfrac{0,25.223}{78,95}.100\%=70,614\%\end{matrix}\right.\)

n_H2 = 4a + b = 0,65 (mol)

=> V_H2 = 0,65.22,4 = 14,56 (l)