a) Gọi số mol Fe, Mg là a, b (mol)

=> 56a + 24b = 1,04 (1)

\(n_{H_2}=\dfrac{0,672}{22,4}=0,03\left(mol\right)\)

PTHH: Fe + 2HCl --> FeCl₂ + H₂

             a--->2a-------------->a

            Mg + 2HCl --> MgCl₂ + H₂

              b---->2b------------->b

=> a + b = 0,03 (2)

(1)(2) => a = 0,01 (mol); b = 0,02 (mol)

m_Fe = 0,01.56 = 0,56 (g)

m_Mg = 0,02.24 = 0,48 (g)

b) n_{HCl(lý thuyết)} = 2a + 2b = 0,06 (mol)

=> \(n_{HCl\left(tt\right)}=\dfrac{0,06.110}{100}=0,066\left(mol\right)\)

=> \(V_{dd.HCl\left(tt\right)}=\dfrac{0,066}{0,1}=0,66\left(l\right)\)

Fe+2HCl->Fecl2+H2

x-----2x-----------------x

Mg+2Hcl->MgCl2+h2

y-------2y----------------y

a)

ta có :\(\left\{{}\begin{matrix}56x+24y=10,2\\x+y=0,35\end{matrix}\right.\)

=>x=0,05625 , y=0,29375

=>m Fe=0,05625.56=3,15g

=>m Mg=7,05g

=>VHCl=\(\dfrac{0,05625.2+0,29375.2}{0,1}\)=7l=7000ml

Mấy bạn giúp mình đi :(

\(a,Fe+H_2SO_4\rightarrow FeSO_4+H_2\\ Fe_2O_3+3H_2SO_4\rightarrow Fe_2\left(SO_4\right)_3+3H_2O\\ n_{H_2}=\dfrac{4,48}{22,4}=0,2\left(mol\right)\\ b,n_{Fe}=n_{H_2}=0,2\left(mol\right)\\ \%m_{Fe}=\dfrac{0,2.56}{12,8}.100\%=87,5\%\\ \%m_{Fe_2O_3}=100\%-87,5\%=12,5\%\\ c,n_{Fe_2O_3}=\dfrac{12,8-11,2}{160}=0,01\left(mol\right)\\ n_{H_2SO_4}=n_{Fe}+3n_{Fe_2O_3}=0,2+3.0,01=0,23\left(mol\right)\\ V_{ddH_2SO_4}=\dfrac{0,23}{0,46}=0,5\left(M\right)\)

a)

\(Zn + 2HCl \to ZnCl_2 + H_2\)

b)

\(n_{H_2} = \dfrac{2,24}{22,4} = 0,1(mol)\)

Theo PTHH : \(n_{HCl} = 2n_{H_2} = 0,1.2 = 0,2(mol)\)

c)

Ta có :

 \(n_{ZnCl_2} = n_{H_2} = 0,1(mol)\\ \Rightarrow m_{ZnCl_2} = 0,1.136 = 13.6(gam)\)

a) PTHH: \(Na_2SO_3+H_2SO_4\rightarrow Na_2SO_4+H_2O+SO_2\uparrow\)

Ta có: \(n_{Na_2SO_3}=\dfrac{12,6}{126}=0,1\left(mol\right)=n_{SO_2}\) \(\Rightarrow V_{SO_2}=0,1\cdot22,4=2,24\left(l\right)\)

b) Ta có: \(\left\{{}\begin{matrix}n_{SO_2}=0,1\left(mol\right)\\n_{Ca\left(OH\right)_2}=1,4\cdot0,1=0,14\left(mol\right)\end{matrix}\right.\) \(\Rightarrow\) Tạo muối trung hòa

PTHH: \(Ca\left(OH\right)_2+SO_2\rightarrow CaSO_3\downarrow+H_2O\)

Ta có: \(\left\{{}\begin{matrix}n_{CaSO_3}=0,1\left(mol\right)=n_{Ns_2SO_4}\\n_{Ca\left(OH\right)_2\left(dư\right)}=0,04\left(mol\right)\end{matrix}\right.\) \(\Rightarrow\left\{{}\begin{matrix}m_{CaSO_3}=0,1\cdot120=12\left(g\right)\\m_{Na_2SO_4}=0,1\cdot142=14,2\left(g\right)\\m_{Ca\left(OH\right)_2\left(dư\right)}=0,04\cdot74=2,96\left(g\right)\end{matrix}\right.\)

\(n_{Na_2SO_3}=0,1\left(mol\right)\\ PTHH:Na_2SO_3+H_2SO_4\rightarrow Na_2SO_4+H_2O+SO_2\)

(mol)          0,1                              0,1             0,1       0,1

\(a.V_{SO_2}=0,1.22,4=2,24\left(l\right)\)

\(b.n_{Ca\left(OH\right)_2}=0,14\left(mol\right)\)

Do \(\dfrac{n_{OH}}{n_{SO_2}}=\dfrac{0,28}{0,1}=2.8>2\rightarrow\) Tạo muối trung hòa và Ca(OH)₂ dư 0,04(mol)

\(PTHH:Ca\left(OH\right)_2+SO_2\rightarrow CaSO_3+H_2O\)

(mol)           0,1           0,1         0,1            0,1

\(m_{Ca\left(OH\right)_2\left(du\right)}=0,04.74=2,96\left(g\right)\\ m_{CaSO_3}=12\left(g\right)\\ m_{H_2O}=0,1.18=1,8\left(g\right)\)