a) \(m_{CuO}=\dfrac{20.40}{100}=8\left(g\right)\) => \(n_{CuO}=\dfrac{8}{80}=0,1\left(mol\right)\)

\(m_{Fe_2O_3}=20-8=12\left(g\right)\) => \(n_{Fe_2O_3}=\dfrac{12}{160}=0,075\left(mol\right)\)

PTHH: CuO + H₂ --t^o--> Cu + H₂O

             0,1--->0,1------>0,1

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

          0,075--->0,225----->0,15

=> m_Cu = 0,1.64 = 6,4 (g)

=> m_Fe = 0,15.56 = 8,4 (g)

b) \(V_{H_2}=\left(0,1+0,225\right).22,4=7,28\left(l\right)\)

a) Gọi số mol H₂ là x

=> nH2O=x(mol)

Theo ĐLBTKL: mA+mH2=mB+mH2O

=> 200 + 2x = 156 + 18x

=> x = 2,75 (mol)

=> VH2=2,75.22,4=61,6(l)

b) Gọi nCuO=a(mol)

nFe2O3=1,5a(mol)

=> 80a + 240a + 102b = 200

=> 320a + 102b = 200

PTHH: CuO + H₂ --t^o--> Cu + H₂O

              a---------------->a

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

             1,5a------------------>3a

=> 64a + 168a + 102b = 156

=> 232a + 102b = 156

=> a = 0,5; b = \(\dfrac{20}{15}\)

%mCuO=\(\dfrac{0,5.80}{200}\).100%=20%

%mFe2O3=\(\dfrac{0,75.160}{200}\).100%=60%

%mAl2O3=\(\dfrac{\dfrac{20}{15}102}{200}\).100%=20%

c) nH2=\(\dfrac{2,75}{5}\)=0,55(mol)

nFeO(tt)=\(\dfrac{36}{72}\)=0,5(mol)

Gọi số mol FeO phản ứng là t (mol)

PTHH: FeO + H₂ --t^o--> Fe + H₂O

              t--------------->t

=> 56t + (0,5-t).72 = 29,6

=> t = 0,4 (mol)

=> H%=\(\dfrac{0,4}{0,5}\).100%=80%

tỉ leejlaf 1:1,5 chứ

\(n_{CuO}=2a\left(mol\right)\Rightarrow n_{Fe_2O_3}=a\left(mol\right)\)

\(m_X=80\cdot2a+160a=80\left(g\right)\)

\(\Rightarrow a=0.25\left(mol\right)\)

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

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

\(n_{H_2}=0.5+0.25\cdot3=1.25\left(mol\right)\)

\(V_{H_2}=1.25\cdot22.4=28\left(l\right)\)

\(m_{cr}=0.5\cdot64+0.5\cdot56=60\left(g\right)\)

\(n_{H_2}=\dfrac{5,04}{22,4}=0,225\left(mol\right)\)

PTHH: CuO + H₂ → Cu + H₂O

Mol:      x         x         x

PTHH: Fe₂O₃ + 3H₂ → 2Fe + 3H₂O

Mol:       y            3y        2y

Ta có hpt:\(\left\{{}\begin{matrix}80x+160y=14\\x+3y=0,225\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}x=0,075\left(mol\right)\\y=0,05\left(mol\right)\end{matrix}\right.\)

\(m_{hh.kim.loại}=m_{Cu}+m_{Fe}=0,075.64+2.0,05.56=10,4\left(g\right)\)

\(n_{H_2}=\dfrac{5,04}{22,4}=0,225\left(mol\right)\)

PTHH:

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

Theo 2 pthh trên: \(n_{H_2O}=n_{H_2}=0,225\left(mol\right)\)

\(\rightarrow m_{H_2O}=0,225.18=4,05\left(g\right)\\ \rightarrow m_{H_2}=0,225.2=0,45\left(g\right)\)

Áp dụng ĐLBTKL, ta có:

\(m_{oxit\left(CuO,Fe_2O_3\right)}+m_{H_2}=m_{\text{kim loại}\left(Cu,Fe\right)}+m_{H_2O}\\ \rightarrow m_{\text{kim loại}\left(Cu,Fe\right)}=14+0,45-4,05=10,4\left(g\right)\)

\(Fe_2O_3+3H_2\rightarrow\left(t^o\right)2Fe+3H_2O\\ CuO+H_2\rightarrow\left(t^o\right)Cu+H_2O\\ Đặt:n_{Fe}=a\left(mol\right);n_{Cu}=0,5a\left(mol\right)\\ m_{hhB}=17,6\\ \Leftrightarrow56a+64.0,5a=17,6\\ \Leftrightarrow a=0,2\left(mol\right)\\ \Rightarrow n_{Fe}=0,2\left(mol\right);n_{Cu}=0,1\left(mol\right)\\ a,n_{H_2}=\dfrac{3}{2}.n_{Fe}+n_{Cu}=\dfrac{3}{2}.0,2+0,1=0,4\left(mol\right)\\ \Rightarrow V_{H_2\left(đktc\right)}=0,4.22,4=8,96\left(l\right)\\ b,Fe+2HCl\rightarrow FeCl_2+H_2\\ n_{HCl}=\dfrac{18,25}{36,5}=0,5\left(mol\right)\\ Vì:\dfrac{0,2}{1}< \dfrac{0,5}{2}\Rightarrow HCldư\\ \Rightarrow ddC:FeCl_2,HCldư\\ n_{FeCl_2}=n_{Fe}=0,2\left(mol\right)\Rightarrow m_{FeCl_2}=0,2.127=25,4\left(g\right)\\ n_{HCl\left(dư\right)}=0,5-0,2.2=0,1\left(mol\right)\)

\(\Rightarrow m_{HCl\left(dư\right)}=0,1.36,5=3,65\left(g\right)\)

\(Tacó:m_{Fe_2O_3}:m_{CuO}=3:2\\ m_{Fe_2O_3}+m_{CuO}=40\\ \Rightarrow m_{Fe_2O_3}=24\left(g\right)\Rightarrow n_{Fe_2O_3}=0,15\left(mol\right)\\ \Rightarrow m_{CuO}=16\left(g\right)\Rightarrow n_{CuO}=0,2\left(mol\right)\\ Fe_2O_3+3H_2-^{t^o}\rightarrow2Fe+3H_2O\left(1\right)\\ CuO+H_2O-^{t^o}\rightarrow Cu+H_2O\left(2\right)\\TheoPT\left(1\right): n_{Fe}=2n_{Fe_2O_3}=0,3\left(mol\right)\\ \Rightarrow m_{Fe}=16,8\left(g\right)\\TheoPT\left(2\right): n_{Cu}=n_{CuO}=0,2\left(mol\right)\\ \Rightarrow m_{Cu}=0,2.64=12,8\left(g\right)\)

\(\left\{{}\begin{matrix}CuO:a\\Fe2O3:2a\end{matrix}\right.\)

a.\(80a+320a=24\Leftrightarrow a=0.06\)

\(\Rightarrow\left\{{}\begin{matrix}CuO=0.06\\Fe2O3=0.12\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}CuO=4.8g\\Fe2O3=19.2g\end{matrix}\right.\)

b.\(CuO+H2\rightarrow Cu+H2O\)

    a           a         a

\(Fe2O3+3H2\rightarrow2Fe+3H2O\)

    2a          6a       4a

\(\Rightarrow V_{H2}=\left(a+6a\right)\times22.4=9.408l\)

c.nHCl = 0.2 mol

\(Fe+2HCl\rightarrow FeCl2+H2\)

 0.1     0.2

m chất rắn còn lại = mCu + m Fe ban đầu - m Fe bị hòa tan

                             = \(a\times64+4a\times56-0.1\times56=11.68g\)

Sai rồi

\(\left[O\right]_{KL}+H_2->H_2O\\ n_{H_2O}=n_{H_2}=\dfrac{14,4}{18}=0,8mol\\ v=0,8.22,4=17,92L\\ m_{KL}=m=47,2-16.0,8=34,4g\)