a) \(n_{Fe}=\dfrac{2,8}{56}=0,05\left(mol\right)\)

PTHH: `Fe + 2HCl -> FeCl_2 + H_2`

           0,05->0,1----->0,05---->0,05

`=> V_{ddHCl} = (0,1)/2 = 0,05 (l)`

b) `V_{H_2} = 0,05.22,4 = 1,12 (l)`

c) `C_{M(FeCl_2)} = (0,05)/(0,05) = 1M`

\(n_{Fe}=\dfrac{2,8}{56}=0,05\left(mol\right)\\ a,PTHH:Fe+2HCl\rightarrow FeCl_2+H_2\\ n_{H_2}=n_{FeCl_2}=n_{Fe}=0,05\left(mol\right)\\ V_{H_2\left(đktc\right)}=0,05.22,4=1,12\left(l\right)\\ V_{H_2\left(đkc\right)}=0,05.24,79=1,2395\left(l\right)\\ b,n_{HCl}=0,1.3=0,3\left(mol\right)\\ Vì:\dfrac{0,05}{1}< \dfrac{0,3}{2}\Rightarrow HCldư\\ n_{HCl\left(dư\right)}=0,3-0,05.2=0,2\left(mol\right)\\ n_{FeCl_2}=n_{Fe}=0,05\left(mol\right)\\ V_{ddsau}=V_{ddHCl}=0,1\left(l\right)\\ b,C_{MddFeCl_2}=\dfrac{0,05}{0,1}=0,5\left(M\right);C_{MddHCl\left(dư\right)}=\dfrac{0,2}{0,1}=2\left(M\right)\)

Ta có n_Fe = \(\dfrac{2,8}{56}\) = 0,05 ( mol )

Fe + 2HCl \(\rightarrow\) FeCl₂ + H₂

0,05...0,1.........0,05.....0,05

=> V_HCl = n : C_M = 0,1 : 2 = 0,05 ( lít )

=> V_H2 = 0,05 . 22,4 = 1,12 ( lít )

=> C_{M FeCl2} = 0,05 : 0,05 = 1 M

PTHH: \(Fe+2HCl\rightarrow FeCl_2+H_2\uparrow\)

a) Ta có: \(n_{Fe}=\dfrac{11,2}{56}=0,2\left(mol\right)=n_{H_2}\) \(\Rightarrow V_{H_2}=0,2\cdot22,4=4,48\left(l\right)\)

b) Theo PTHH: \(n_{HCl}=2n_{Fe}=0,4\left(mol\right)\)

\(\Rightarrow C\%_{HCl}=\dfrac{0,4\cdot36,5}{200}\cdot100\%=7,3\%\)

b) Theo PTHH: \(n_{FeCl_2}=n_{H_2}=0,2\left(mol\right)\) \(\Rightarrow\left\{{}\begin{matrix}m_{FeCl_2}=0,2\cdot127=25,4\left(g\right)\\m_{H_2}=0,2\cdot2=0,4\left(g\right)\end{matrix}\right.\)

Mặt khác: \(m_{dd}=m_{Fe}+m_{ddHCl}-m_{H_2}=210,8\left(g\right)\)

\(\Rightarrow C\%_{FeCl_2}=\dfrac{25,4}{210,8}\cdot100\%\approx12,05\%\)

a,\(n_{Fe}=\dfrac{28}{56}=0,5\left(mol\right)\)

PTHH: Fe + 2HCl → FeCl₂ + H₂

Mol:    0,5       1           0,5           0,5

\(V_{ddHCl}=\dfrac{1}{2}=0,5\left(l\right)\)

b,\(V_{H_2}=0,5.22,4=11,2\left(l\right)\)

c,\(C_{M_{ddFeCl_2}}=\dfrac{0,5}{0,5}=1M\)

Bài 1 xem lại đề phần 2 nhé=)

3.

\(n_{Fe}=\dfrac{2,8}{56}=0,05\left(mol\right)\\ PTHH:\)

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

0,05->0,1---->0,05---->0,05

a. \(V_{HCl}=\dfrac{0,1}{2}=0,05\left(l\right)\)

b. \(V_{H_2}=0,05.22,4=1,12\left(l\right)\)

c. \(CM_{FeCl_2}=\dfrac{0,05}{0,05}=1M\)

`HaNa♬D`

1

\(1.Na_2O+H_2O\rightarrow2NaOH\\ 2.2KClO_3\xrightarrow[]{t^0}2KCl+3O_2\)

KCl ko ra đc AlCl3 nhé

\(n_{Fe}=\dfrac{8,4}{56}=0,15\left(mol\right)\)

PTHH: 

  \(Fe+2HCl\rightarrow FeCl_2+H_2\)

0,15     0,3                       0,15

\(a,V_{H_2}=0,15.22,4=3,36\left(l\right)\)

\(b,C_{M_{HCl}}=\dfrac{n}{V}=\dfrac{0,3}{0,1}=3M\)

\(n_{Zn}=\dfrac{130}{65}=2mol\\ Zn+2HCl\rightarrow ZnCl_2+H_2\\ n_{Zn}=n_{H_2}=2mol\\ V_{H_2}=2.22,4=44,8l\\ 1000ml=1l\\ n_{HCl}=2.2=4mol\\ C_{M_{HCl}}=\dfrac{4}{1}=4M\)

\(n_{Zn}=\dfrac{m_{Zn}}{M_{Zn}}=\dfrac{130}{65}=2mol\) 

PTHH: Zn + 2HCl \(\rightarrow\) ZnCl₂ + H₂

TL;       1        2          1          1

mol:      2 \(\rightarrow\) 4

\(m_{HCl}=n.M=4.36,5=146g\) 

đổi 1000 ml= 1l

\(C\%_{ddHCl}=\dfrac{m_{HCl}}{V_{HCl}}.100\%=\dfrac{146}{1}.100=14600\%\)

số hơi lớn em xem lại đề nhé

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

 \(m_{HCl}=109,5.10\%=10,95\left(g\right)\Rightarrow n_{HCl}=\dfrac{10,95}{36,5}=0,3\left(mol\right)\)

PTHH: 2Al + 6HCl → 2AlCl₃ + 3H₂

Mol:      0,1      0,3         0,1       0,15

Ta có: \(\dfrac{0,1}{2}=\dfrac{0,3}{6}\) ⇒ Al hết, HCl hết

\(V_{H_2}=0,15.22,4=3,36\left(l\right)\)

b, \(m_{AlCl_3}=0,1.133,5=13,35\left(g\right)\)

c, m_{dd sau pứ} = 2,7 + 109,5 - 0,15.2 = 111,9 (g)

\(C\%_{ddAlCl_3}=\dfrac{13,35.100\%}{111,9}=11,93\%\)

PTHH: \(2Al+6HCl\rightarrow2AlCl_3+3H_2\uparrow\)

Ta có: \(\left\{{}\begin{matrix}n_{Al}=\dfrac{2,7}{27}=0,1\left(mol\right)\\n_{HCl}=\dfrac{109,5\cdot10\%}{36,5}=0,3\left(mol\right)\end{matrix}\right.\)

Xét tỉ lệ: \(\dfrac{0,1}{2}=\dfrac{0,3}{6}\) \(\Rightarrow\) Al và HCl đều p/ứ hết

\(\Rightarrow\left\{{}\begin{matrix}n_{AlCl_3}=0,1\left(mol\right)\\n_{H_2}=0,15\left(mol\right)\end{matrix}\right.\) \(\Rightarrow\left\{{}\begin{matrix}m_{AlCl_3}=0,1\cdot133,5=13,35\left(g\right)\\V_{H_2}=0,15\cdot22,4=3,36\left(l\right)\\m_{H_2}=0,15\cdot2=0,3\left(g\right)\end{matrix}\right.\)

Mặt khác: \(m_{dd}=m_{Al}+m_{ddHCl}-m_{H_2}=111,9\left(g\right)\)

\(\Rightarrow C\%_{AlCl_3}=\dfrac{13,35}{111,9}\cdot100\%\approx11,93\%\)