n Al=0,25 mol

2Al + 6HCl → 2AlCl₃ + 3H₂

0,25---0,75------0,25------0,375 mol

=>VH2=0,375.22,4=8,4l

=>m AlCl3=0,25.133,5=33,375g

=>CM HCl=\(\dfrac{0,75}{2}\)=0,375M

a, \(Mg+2HCl\rightarrow MgCl_2+H_2\)

b, \(n_{Mg}=\dfrac{4,8}{24}=0,2\left(mol\right)\)

Theo PT: \(n_{H_2}=n_{Mg}=0,2\left(mol\right)\Rightarrow V_{H_2}=0,2.22,4=4,48\left(l\right)\)

c, \(n_{HCl}=2n_{Mg}=0,4\left(mol\right)\Rightarrow V_{HCl}=\dfrac{0,4}{2}=0,2\left(l\right)=200\left(ml\right)\)

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

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

Theo PT: \(n_{H_2}=\dfrac{3}{2}n_{Al}=0,3\left(mol\right)\Rightarrow V_{H_2}=0,3.22,4=6,72\left(l\right)\)

c, \(n_{AlCl_3}=n_{Al}=0,2\left(mol\right)\Rightarrow m_{AlCl_3}=0,2.133,5=26,7\left(g\right)\)

Ta có: \(n_{Al}=\dfrac{4,86}{27}=0,18\left(mol\right)\)

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

a, \(n_{HCl}=3n_{Al}=0,54\left(mol\right)\Rightarrow C_{M_{HCl}}=\dfrac{0,54}{0,15}=3,6\left(M\right)\)

b, \(n_{AlCl_3}=n_{Al}=0,18\left(mol\right)\Rightarrow m_{AlCl_3}=0,18.133,5=24,03\left(g\right)\)

c, \(n_{H_2}=\dfrac{3}{2}n_{Al}=0,27\left(mol\right)\Rightarrow V_{H_2}=0,27.24,79=6,6933\left(l\right)\)

Fe + 2HCl -> FeCl2 + H2

1         2            1         1

0,5      1            0,5      0,5 

n_Fe= m/M = 26.3 / 56 = 0,5 mol

a) VH= n . 22,4 = 0,5 . 22,4 = 11,2 lít

b) m_{ct HCl}= n . M = 0,5 . 36,5 = 18,25g

C% = ( m_{ct . 100 )/ mdd} =18,25 . 100 : 800 = 2,28125%

a) 

2Al + 6HCl -> 2AlCl3 + 3H2

  2           6             2            3

0,19       0,57        0,19       0,285

n_Al= m/M = 5,003/27= 0,19 mol

b) 

V_H2= n . 22,4 = 0,285 . 22,4 = 6,384 lít

c) C_{M HCl}= n/V = 0,57 / 0,2 = 2,85M

d)     H₂      +     CuO    ->    Cu    +    H₂O ( điều kiện nhiệt độ nha mik k đánh kí hiệu lên mũi tên đc )

         1                  1              1               1

                                         0,15625

n_CuO= 12,5 / 80 = 0,15625 mol

=> tính số mol theo CuO

m_Cu= n. M = 0,15625 . 64 = 10g

bạn để bài mấy được k

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

b, \(n_{Al}=\dfrac{8,1}{27}=0,3\left(mol\right)\)

Theo PT: \(n_{H_2}=\dfrac{3}{2}n_{Al}=0,45\left(mol\right)\Rightarrow V_{H_2}=0,45.22,4=10,08\left(l\right)\)

c, Ta có: m _{dd sau pư} = 8,1 + 200 - 0,45.2 = 207,2 (g)

Theo PT: \(n_{AlCl_3}=n_{Al}=0,3\left(mol\right)\)

\(\Rightarrow C\%_{AlCl_3}=\dfrac{0,3.133,5}{207,2}.100\%\approx19,33\%\)

\(a.2Al+6HCl\rightarrow2AlCl_3+3H_2\\ b.n_{Al}=0,2\left(mol\right)\\ n_{HCl}=3n_{Al}=0,6\left(mol\right)\\ C\%_{HCl}=\dfrac{0,6.36,5}{150}.100=14,6\%\\ c.n_{H_2}=\dfrac{3}{2}n_{Al}=0,3\left(mol\right)\\ Bảotòannguyêntố\left(H\right)\Rightarrow n_{H_2O}=n_{H_2}=0,3\left(mol\right)\\ Bảotoànkhốilượng:m_{H_2}+m_{oxit}=m_{Fe}+m_{H_2O}\\ \Rightarrow m_{Fe}=0,3.2+17,4-0,3.18=12,6\left(g\right)\\ \Rightarrow n_{Fe}=0,225\left(mol\right)\\ Tabiết:Oxitsắtlàbaogồm:Fe,O\\ \Rightarrow m_O=17,4-12,6=4,8\left(g\right)\\ \Rightarrow n_O=0,3\left(mol\right)\\ GọiCToxitsắtlà:Fe_xO_y\left(x,y>0,x,ynguyên\right)\\ Tacó:x:y=0,225:0,3=3:4\\ VậyCToxitsắtcầntìmlàFe_3O_4\)

PT: \(Zn+2HCl\rightarrow ZnCl_2+H_2\)

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

Theo PT: \(\left\{{}\begin{matrix}n_{H_2}=n_{Zn}=0,2\left(mol\right)\\n_{HCl}=2n_{Zn}=0,4\left(mol\right)\end{matrix}\right.\)

\(\Rightarrow V_{H_2}=0,2.22,4=4,48\left(l\right)\)

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

Bài 1.

a/ PTHH: Zn + 2HCl ===> ZnCl₂ + H₂

b/ n_Zn = 32,5 / 65 = 0,5 mol

=> n_H2 = n_Zn = 0,5 mol

=> V_H2(đktc) = 0,5 x 22,4 = 11,2 lít

Bài 2/

a/ PTHH: 2Al + 6HCl ==> 2AlCl₃ + 3H₂

b/ n_Al = 4,05 / 27 = 0,15 mol

=> n_H2 = 0,225 mol

=> V_H2(đktc) = 0,225 x 22,4 = 5,04 lít

=> n_AlCl3 = 0,15 mol

=> m_AlCl3 = 0,15 x 133,5 = 20,025 gam