nH2=0.1(mol)

PTHH:Fe+H2SO4->FeSO4+H2

Fe2O3+3H2SO4->Fe2(SO4)3+3H2O

Theo pthh1:nFe=nH2->nFe=0.1(mol)

mFe=0.1*56=5.6(g)->%Fe=5.6:21.6*100=25.9%

%Fe2O3=100-25.9=74.1%

câu b câu c không liên quan đến đề bài bạn ơi,Chỉ có FeSO4,Fe2(SO4)3,và HCl thôi nhé,không có H2SO4 và MgSO4 đâu

a, \(n_{H_2}=\dfrac{6,72}{22,4}=0,3\left(mol\right)\)

m_{hh Zn và Fe} = 21,6-3 = 18,6 (g)

PTHH: Zn + H₂SO₄ → ZnSO₄ + H₂

Mol:      x                                           x

PTHH: Fe + H₂SO₄ → FeSO₄ + H₂

Mol:      y                                           y 

Ta có: \(\left\{{}\begin{matrix}65x+56y=18,6\\x+y=0,3\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}x=0,2\\y=0,1\end{matrix}\right.\)

\(\%m_{Zn}=\dfrac{0,2.65.100\%}{21,6}=60,19\%\)

\(\%m_{Fe}=\dfrac{0,1.56.100\%}{21,6}=25,93\%\)

\(\%m_{Cu}=100-60,19-25,93=13,88\%\)

b,

PTHH: Zn + H₂SO₄ → ZnSO₄ + H₂

Mol:     0,2     0,2                            0,2

PTHH: Fe + H₂SO₄ → FeSO₄ + H₂

Mol:     0,1      0,1                            0,1 

\(m_{H_2SO_4}=\left(0,1+0,2\right).98=29,4\left(g\right)\Rightarrow m_{ddH_2SO_4}=\dfrac{29,4.100\%}{25\%}=117,6\left(g\right)\)

c,m_{dd sau pư} = 21,6+117,6- (0,1+0,2).2 = 138,6 (g)

\(C\%_{ddZnSO_4}=\dfrac{0,2.161.100\%}{138,6}=23,23\%\)

\(C\%_{ddFeSO_4}=\dfrac{0,1.152.100\%}{138,6}=10,97\%\)

a, PT: \(CuO+H_2SO_4\rightarrow CuSO_4+H_2O\)

\(FeO+H_2SO_4\rightarrow FeSO_4+H_2O\)

Gọi: \(\left\{{}\begin{matrix}n_{CuO}=x\left(mol\right)\\n_{FeO}=y\left(mol\right)\end{matrix}\right.\) ⇒ 80x + 72y = 11,2 (1)

Ta có: \(n_{H_2SO_4}=0,15.1=0,15\left(mol\right)\)

Theo PT: \(n_{H_2SO_4}=n_{CuO}+n_{FeO}=x+y=0,15\left(2\right)\)

Từ (1) và (2) ⇒ x = 0,05 (mol), y = 0,1 (mol)

\(\Rightarrow\left\{{}\begin{matrix}\%m_{CuO}=\dfrac{0,05.80}{11,2}.100\%\approx35,71\%\\\%m_{FeO}\approx64,28\%\end{matrix}\right.\)

b, Theo PT: \(\left\{{}\begin{matrix}n_{CuSO_4}=n_{Cu}=0,05\left(mol\right)\\n_{FeSO_4}=n_{FeO}=0,1\left(mol\right)\end{matrix}\right.\)

\(\Rightarrow\left\{{}\begin{matrix}C_{M_{CuSO_4}}=\dfrac{0,05}{0,15}=\dfrac{1}{3}\left(M\right)\\C_{M_{FeSO_4}}=\dfrac{0,1}{0,15}=\dfrac{2}{3}\left(M\right)\end{matrix}\right.\)

\(n_{HCl}=0,4.0,2=0,08\left(mol\right)\\PTHH:\)

\(CuO+2HCl\rightarrow CuCl_2+H_2O\)

x------->2x----->x

\(MgO+2HCl\rightarrow MgCl_2+H_2O\)

y------->2y------>y

Có hệ PT: \(\left\{{}\begin{matrix}80x+40y=2,8\\2x+2y=0,08\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}x=0,03\\y=0,01\end{matrix}\right.\)

a)

\(m_{CuO}=80.0,03=2,4\left(g\right)\\ m_{MgO}=40.0,01=0,4\left(g\right)\)

b)

\(\%_{m_{CuO}}=\dfrac{2,4.100\%}{2,8}=85,71\%\\ \%_{m_{MgO}}=\dfrac{0,4.100\%}{2,8}=14,29\%\)

c)

\(m_{CuCl_2}=135x=135.0,03=4,05\left(g\right)\)

\(n_{H_2}=\dfrac{5,6}{22,4}=0,25(mol)\\ Mg+H_2SO_4\to MgSO_4+H_2\\ MgO+H_2SO_4\to MgSO_4+H_2O\\ \Rightarrow n_{Mg}=0,25(mol)\\ a,\begin{cases} \%_{Mg}=\dfrac{0,25.24}{14}.100\%=42,86\%\\ \%_{MgO}=100\%-42,86\%=57,14\% \end{cases}\\ b,n_{MgO}=\dfrac{14-0,25.24}{40}=0,2(mol)\\ \Rightarrow \Sigma n_{H_2SO_4}=0,2+0,25=0,45(mol)\\ \Rightarrow C\%_{H_2SO_4}=\dfrac{0,45.98}{200}.100\%=22,05\%\)

Ta có: 

n H2 = 0,05 ( mol )

1.PTHH

Fe + H2SO4 ====> FeSO4 + H2

FeO + H2SO4 ====> FeSO4 + H2O

theo pthh: n Fe = n H2 = 0,05 ( mol )

=> m Fe = 2,8 ( g )

=> m FeO = 7,2 ( g ) => n FeO = 0,1 ( mol )

2.

theo pthh: n H2SO4 = 0,05 + 0,1 = 0,15

  => m H2SO4 = 14,7 ( g )

  => m dd H2SO4 9,8% = 150 ( g )

\(n_{H2}=\dfrac{1,12}{22,4}=0,05\left(mol\right)\)

Pt : \(Fe+H_2SO_4\rightarrow FeSO_4+H_2|\)

        1           1               1          1

      0,05      0,05          0,05     0,05

      \(FeO+H_2SO_4\rightarrow FeSO_4+H_2O|\)

        1             1                1           1

      0,1           0,1             0,1

1) \(n_{Fe}=\dfrac{0,05.1}{1}=0,05\left(mol\right)\)

\(m_{Fe}=0,05.56=2,8\left(g\right)\)

\(m_{FeO}=10-2,8=7,2\left(g\right)\)

2) Có : \(m_{FeO}=7,2\left(g\right)\)

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

\(n_{H2SO4\left(tổng\right)}=0,05+0,1=0,15\left(mol\right)\)

\(m_{H2SO4}=0,15.98=14,7\left(g\right)\)

\(m_{ddH2SO4}=\dfrac{14,7.100}{9,8}=150\left(g\right)\)

3) \(n_{FeSO4\left(tổng\right)}=0,05+0,1=0,15\left(mol\right)\)

⇒ \(m_{FeSO4}=0,15.152=22,8\left(g\right)\)

\(m_{ddspu}=10+150-\left(0,05.2\right)=159,9\left(g\right)\)

\(C_{FeSO4}=\dfrac{22,8.100}{159,9}=14,26\)⁰/₀

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