\(n_{H_2}=\dfrac{2.479}{24.79}=0.1\left(mol\right)\)

\(Fe+2HCl\rightarrow FeCl_2+H_2\)

\(0.1.......0.2..........0.1......0.1\)

\(m_{Fe}=0.1\cdot56=5.6\left(g\right)\)

\(C_{M_{HCl}}=\dfrac{0.2}{0.2}=1\left(M\right)\)

a)

Gọi $n_{Fe} = a(mol) ; n_{Al} =b (mol) \Rightarrow 56a + 27b = 11(1)$
$Fe + 2HCl \to FeCl_2 + H_2$
$2Al + 6HCl \to 2AlCl_3 + 3H_2$
Theo PTHH : $n_{H_2} = a + 1,5b = \dfrac{8,96}{22,4} = 0,4(2)$

Từ (1)(2) suy ra : a = 0,1 ; b = 0,2

$\%m_{Fe} = \dfrac{0,1.56}{11}.100\% = 50,9\%$
$\%m_{Al} = 100\% - 50,9\% = 49,1\%$

b) $n_{HCl} = 2n_{H_2} = 0,8(mol)$
$\Rightarrow C_{M_{HCl}} = \dfrac{0,8}{0,4} = 2M$

c)

$C_{M_{FeCl_2}} = \dfrac{0,1}{0,4} = 0,25M$
$C_{M_{AlCl_3}} =\dfrac{0,2}{0,4} = 0,5M$

a, \(Fe+2HCl\rightarrow FeCl_2+H_2\)

b, \(n_{H_2}=\dfrac{9,916}{24,79}=0,4\left(mol\right)\)

\(n_{Fe}=n_{H_2}=0,4\left(mol\right)\Rightarrow m_{Fe}=0,4.56=22,4\left(g\right)\)

c, \(n_{HCl}=2n_{H_2}=0,8\left(mol\right)\Rightarrow C_{M_{HCl}}=\dfrac{0,8}{0,2}=4\left(M\right)\)

\(m_{H_2}=\dfrac{7,437}{24,79}=0,3mol\\ 2Al+3H_2SO_4\rightarrow Al_2\left(SO_4\right)_3+3H_2\)

0,2        0,3               0,1                0,3

\(m_{Al}=0,2.27=5,4g\\ V_{ddH_2SO_4}=\dfrac{0,3}{0,5}=0,6l\\ C_{M_{Al_2\left(SO_4\right)_3}}=\dfrac{0,1}{0,6}=\dfrac{1}{6}\approx0,167M\)

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

PTHH:

\(2Al+6HCl\rightarrow2AlCl_3+3H_2\) 

0,2      0,6           0,2          0,3

\(m_{Al}=0,2.27=5,4\left(g\right)\)

\(C_{M\left(HCl\right)}=\dfrac{0,6}{0,6}=1\left(M\right)\)

\(m_{AlCl_3}=0,2.133,5=26,7\left(g\right)\)

a) 2Al + 3H₂SO₄ --> Al₂(SO₄)₃ + 3H₂

b) \(n_{H_2}=\dfrac{8,96}{22,4}=0,4\left(mol\right)\)

PTHH: 2Al + 3H₂SO₄ --> Al₂(SO₄)₃ + 3H₂

____\(\dfrac{4}{15}\)<----0,4<--------------------0,4

=> \(m_{Al}=\dfrac{4}{15}.27=7,2\left(g\right)\)

c) \(C_{M\left(H_2SO_4\right)}=\dfrac{0,4}{0,15}=2,667M\)

Có lẽ đề cho dd HCl 1M (1 mol/l) chứ bạn nhỉ?

a, PT: \(2Al+6HCl\rightarrow2AlCl_3+3H_2\)

b, \(n_{Al}=\dfrac{2,7}{27}=0,1\left(mol\right)\)

Theo PT: \(n_{H_2}=\dfrac{3}{2}n_{Al}=0,15\left(mol\right)\Rightarrow V_{H_2}=0,15.22,4=3,36\left(l\right)\)

c, \(n_{HCl}=3n_{Al}=0,3\left(mol\right)\Rightarrow V_{ddHCl}=\dfrac{0,3}{1}=0,3\left(l\right)\)

\(n_{Zn}=\dfrac{13}{65}=0,2\left(mol\right)\\ n_{HCl}=\dfrac{18,25}{35}=0,5\left(mol\right)\\ a.Zn+2HCl\rightarrow ZnCl_2+H_2\\ Vì:\dfrac{0,5}{2}>\dfrac{0,2}{1}\Rightarrow HCldư\\ n_{HCl\left(dư\right)}=0,5-0,2.2=0,1\left(mol\right)\\ m_{HCl}=0,1.36,5=3,65\left(g\right)\\ c.n_{ZnCl_2}=n_{Zn}=n_{H_2}=0,2\left(mol\right)\\ m_{ZnCl_2}=0,2.136=27,2\left(g\right)\\ V_{H_2\left(đktc\right)}=0,2.22,4=4,48\left(l\right)\)

\(n_{Zn}=\dfrac{13}{65}=0,2\left(mol\right)\)

\(n_{HCl}=\dfrac{18,25}{36,5}=0,5\left(mol\right)\)

a) Pt : \(Zn+2HCl\rightarrow ZnCl_2+H_2|\)

            1          2            1            1

           0,2       0,5         0,2         0,2

b) Lập tỉ số so sánh : \(\dfrac{0,2}{1}< \dfrac{0,5}{2}\)

                 ⇒ Zn phản ứng hết , HCl dư

                 ⇒ Tính toán dựa vào số mol của Zn

\(n_{HCl\left(dư\right)}=0,5-\left(0,2.2\right)=0,1\left(mol\right)\)

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

c) \(n_{ZnCl2}=\dfrac{0,2.1}{1}=0,2\left(mol\right)\)

⇒ \(m_{ZnCl2}=0,2.136=27,2\left(g\right)\)

\(n_{H2}=\dfrac{0,2.1}{1}=0,2\left(mol\right)\)

\(V_{H2\left(dktc\right)}=0,2.22,4=4,48\left(l\right)\)

 Chúc bạn học tốt

PTHH: \(Na_2SO_3+2HCl\rightarrow2NaCl+H_2O+SO_2\uparrow\)

Ta có: \(n_{SO_2}=\dfrac{2,479}{22,4}=\dfrac{2479}{22400}\left(mol\right)\)

\(\Rightarrow\left\{{}\begin{matrix}n_{Na_2SO_3}=\dfrac{2479}{22400}\left(mol\right)\\n_{HCl}=\dfrac{2479}{11200}\left(mol\right)\end{matrix}\right.\) \(\Rightarrow\left\{{}\begin{matrix}m_{Na_2SO_3}=\dfrac{2479}{22400}\cdot126\approx13,94\left(g\right)\\C_{M_{HCl}}=\dfrac{\dfrac{2479}{11200}}{0,25}\approx0,89\left(M\right)\end{matrix}\right.\)