500ml = 0,5l

\(n_{HCl}=0,2.0,5=0,1\left(mol\right)\)

a) Pt : \(Fe+2HCl\rightarrow FeCl_2+H_2|\)

              1         2           1          1

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

b) \(n_{Fe}=\dfrac{0,1.1}{2}=0,05\left(mol\right)\)

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

c) \(n_{H2}=\dfrac{0,1.1}{2}=0,05\left(mol\right)\)

\(V_{H2\left(dktc\right)}=0,05.22,4=1,12\left(l\right)\)

d) \(n_{FeCl2}=\dfrac{0,05.1}{1}=0,05\left(mol\right)\)

⇒ \(m_{FeCl2}=0,05.127=6,35\left(g\right)\)

 Chúc bạn học tốt

cíuuu em mn ớiii. maii em thii:(

`a)PTHH:`

`Zn + 2HCl -> ZnCl_2 + H_2`

`0,2`   `0,4`                `0,2`      `0,2`       `(mol)`

`n_[Zn]=13/65=0,2(mol)`

`b)V_[H_2]=0,2.22,4=4,48(l)`

`c)m_[dd HCl]=[0,4.36,5]/5 . 100=292(g)`

`=>C%_[ZnCl_2]=[0,2.136]/[13+292-0,2.2].100~~8,93%`

Zn + 2HCl → ZnCl₂ + H₂

0,2-----0,4------0,2------0,2

n Zn=0,2 mol

=>VH2=0,2.22,4=4,48l

=>mddHcl=292g

C%=\(\dfrac{0,2.136}{13+292-0,2.2}100=8,929\%\)

\(n_{Al}=\dfrac{10,8}{27}=0,4\left(mol\right)\)

PTHH :

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

0,4      1,2           0,4         0,6 

\(a,V_{H_2}=0,6.22,4=13,44\left(l\right)\)

\(b,m_{HCl}=1,2.36,5=43,8\left(g\right)\)

\(c,m_{AlCl_3}=133,5.0,4=53,4\left(g\right)\)

\(m_{ddHCl}=\dfrac{43,8.100}{10}=438\left(g\right)\)

\(m_{ddAlCl_3}=10,8+438-\left(0,6.2\right)=447,6\left(g\right)\)

\(C\%=\dfrac{53,8}{447,6}.100\%\approx12,02\%\)

nNa = 4.6/23 = 0.2 (mol) 

Na + H2O => NaOH + 1/2H2

0.2....................0.2..........0.1

VH2 = 0.1*22.4 = 2.24 (l) 

mNaOH = 0.2*40 = 8 (g) 

Đề thiếu khối lượng nước rồi em nhé !

\(1) 2Na + 2H_2O \to 2NaOH + H_2\\ 2) n_{Na} = \dfrac{4,6}{23} = 0,2(mol)\\ n_{H_2} = \dfrac{1}{2}n_{H_2} = 0,1(mol)\\ V_{H_2} = 0,1.22,4 = 2,24(lít)\\ 3) n_{NaOH} = n_{Na} = 0,2(mol)\\ m_{NaOH} = 0,2.40 = 8(gam)\)

4) Thiếu dữ kiện

n_Al = 5.4 / 27 = 0.2 (mol)

2Al + 6HCl => 2AlCl₃ + 3H₂

0.2......0.6............0.2.......0.3

a) V_H2 = 0.3 * 22.4 = 6.72 (l) 

b) m_AlCl3 = 0.2 * 133.5 = 26.7 (g) 

c) VddHCl = 0.6 / 1.5 = 0.4 (l) 

d) C_MAlCl3 = 0.2 / 0.4 = 0.5 (M) 

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

Ta có: \(n_{Al}=\dfrac{5,4}{27}=0,2\left(mol\right)\)

\(\Rightarrow\left\{{}\begin{matrix}n_{HCl}=0,6\left(mol\right)\\n_{AlCl_3}=0,2\left(mol\right)\\n_{H_2}=0,3\left(mol\right)\end{matrix}\right.\) \(\Rightarrow\left\{{}\begin{matrix}V_{H_2}=0,3\cdot22,4=6,72\left(l\right)\\m_{AlCl_3}=0,2\cdot133,5=26,7\left(g\right)\\V_{HCl}=\dfrac{0,6}{1,5}=0,4\left(l\right)=400\left(ml\right)\\C_{M_{AlCl_3}}=\dfrac{0,2}{0,4}=0,5\left(M\right)\end{matrix}\right.\)

1)

a) Fe + 2HCl --> FeCl₂ + H₂

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

PTHH: Fe + 2HCl --> FeCl₂ + H₂

           0,15->0,3--->0,15-->0,15

=> V_H2 = 0,15.22,4 = 3,36 (l)

c) m_{dd sau pư} = 8,4 + 250 - 0,15.2 = 258,1 (g)

=> \(C\%_{FeCl_2}=\dfrac{0,15.127}{258,1}.100\%=7,38\%\)

2)

a) Zn + 2HCl --> ZnCl₂ + H₂

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

PTHH: Zn + 2HCl --> ZnCl₂ + H₂

            0,2-->0,4---->0,2--->0,2

=> V_H2 = 0,2.22,4 = 4,48 (l)

m_ZnCl2 = 0,2.136 = 27,2 (g)

c) \(C_{M\left(dd.HCl\right)}=\dfrac{0,4}{0,2}=2M\)

d) 

PTHH: A + 2HCl --> ACl₂ + H₂

           0,2<--0,4

=> \(M_A=\dfrac{4,8}{0,2}=24\left(g/mol\right)\)

=> A là Mg(Magie)

`a)PTHH:`

`Mg + 2HCl -> MgCl_2 + H_2 \uparrow`

`0,2`                                      `0,2`            `(mol)`

`b)n_[Mg]=[4,8]/24=0,2(mol)`

  `=>V_[H_2]=0,2.22,4=4,48(l)`

`c)`

`CuO + H_2 -> Cu + H_2 O`

`0,2`       `0,2`                                 `(mol)`

   `=>m_[CuO]=0,2.80=16(g)`

n_HCl=0,2.0,5=0,1(mol)

a,Fe+2HCl→FeCl2+H2

⇒n_Fe=n_FeCl2=1/2n_HCl=0,05(mol)

b,m_Fe=0,05.56=2,8(g)

c,m_FeCl2=0,05.127=6,35(g)

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

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

 TL:        1        2           1         1

mol:     0,15 \(\rightarrow\) 0,3 \(\rightarrow\) 0,15 \(\rightarrow\) 0,15

Đổi \(100ml=0,1l\)

\(b.C_{M_{ddHCl}}=\dfrac{n}{V_{dd}}=\dfrac{0,3}{0,1}=3M\)

\(c.V_{H_2}=n.22,4=0,15.22,4=33,6l\)

d. Ta có: \(n_{H_2}=0,15mol\)

PTHH: H₂ + CuO \(\rightarrow\) Cu + H₂O

  TL:     1         1          1        1

mol:  0,15 \(\rightarrow\) 0,15 \(\rightarrow\) 0,15 \(\rightarrow\) 0,15

\(n_{CuO}=\dfrac{m}{M}=\dfrac{20}{80}=0,25mol\)

Lập tỉ lệ: \(\dfrac{n_{H_2}}{1}:\dfrac{n_{CuO}}{1}\)

      \(\Leftrightarrow=\dfrac{0,15}{1}< \dfrac{0,25}{1}\)

\(\Rightarrow\) H₂ hết, CuO dư \(\Rightarrow\) Tính theo H₂

\(m_{CuO}=n.M=0,15.64=9,6g\)