\(n_{H_2}=\dfrac{0,896}{22,4}=0,04mol\\ Zn+2HCl\rightarrow ZnCl_2+H_2\uparrow\)

0,04       0,08        0,04        0,04

\(m_{Zn}=0,04.65=2,6g\\ m_{ddHCl}=\dfrac{0,04.36,5}{14,6}\cdot100=10g\)

a) $2Al + 6HCl \to 2AlCl_3 + 3H_2$

b) n Al = 8,1/27 = 0,3(mol)

Theo PTHH : 

n H2 = 3/2 n Al = 0,45(mol)

V H2 = 0,45.22,4 = 10,08(lít)

c) n AlCl3 = n Al = 0,3(mol)

m AlCl3 = 0,3.133,5 = 40,05(gam)

d) n HCl = 3n Al = 0,9(mol)

m dd HCl = 0,9.36,5/7,3% = 450(gam)

Sau phản ứng : 

m dd = 8,1 + 450  -0,45.2 = 457,2(gam)

C% AlCl3 = 40,05/457,2  .100% = 8,76%

a) Lập công thức hóa học của muối kẽm clorua:  Z n C l 2

b) Khối lượng muối Z n C l 2  = 6,5 + 7,3 – 0,2 = 13,6 (gam)

a)

$2Al + 6HCl \to 2AlCl_3 + 3H_2$

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

Theo PTHH : $n_{HCl} = 3n_{Al} = 1,2(mol)$
$\Rightarrow m = \dfrac{1,2.36,5}{14,6\%} = 300(gam)$

b) $n_{H_2} = \dfrac{3}{2}n_{Al} = 0,6(mol)$

$M_xO_y + yH_2 \xrightarrow{t^o}xM + yH_2O$

Theo PTHH : $n_{oxit} = \dfrac{1}{y}.n_{H_2} = \dfrac{0,6}{y}(mol)$
$\Rightarrow \dfrac{0,6}{y}(Mx + 16y) = 34,8$

$\Rightarrow \dfrac{x}{y}.M = 42$

Với x = 3 ; y = 4 thì $M = 56(Fe)$

Vậy oxit là $Fe_3O_4$

\(n_{Zn}=\dfrac{6,5}{65}=0,1mol\)

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

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

\(V_{H_2}=0,1.22,4=2,24l\)

\(m_{ZnCl_2}=0,1.136=13,6g\)

\(n_{Zn}=\dfrac{6,5}{65}=0,1mol\)

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

0,1     0,2          0,1          0.1

\(V_{H_2}=0,1\cdot22,4=2,24l\)

\(m_{ZnCl_2}=0,1\cdot135=13,5g\)

\(a,PTHH:Zn+2HCl\rightarrow ZnCl_2+H_2\)

\(b,n_{Zn}=\dfrac{m}{M}=\dfrac{6,5}{65}=0,1mol\)

\(\rightarrow n_{H_2}=0,1mol\Rightarrow V_{H_2}=n.22,4=0,1.22,4=2,24l\)

\(\rightarrow n_{ZnCl_2}=0,1\Rightarrow m_{ZnCl_2}=n.M=0,1.101,5=10,15g\)

a) PTHH: \(Fe_3O_4+8HCl\rightarrow FeCl_2+2FeCl_3+4H_2O\)

b) Bảo toàn khối lượng: \(m_{muối.khan}=m_{Fe_3O_4}+m_{HCl}-m_{H_2O}=11,3\left(g\right)\)

a, \(Zn+2HCl\rightarrow ZnCl_2+H_2\)

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

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

c, \(n_{ZnCl_2}=n_{Zn}=0,2\left(mol\right)\Rightarrow m_{ZnCl_2}=0,2.136=27,2\left(g\right)\)

d, \(n_{HCl}=2n_{Zn}=0,4\left(mol\right)\Rightarrow m_{HCl}=0,4.36,5=14,6\left(g\right)\)

\(\Rightarrow m_{ddHCl}=\dfrac{14,6}{7,3\%}=200\left(g\right)\)

⇒ m _{dd sau pư} = 13 + 200 - 0,2.2 = 212,6 (g)

\(\Rightarrow C\%_{ZnCl_2}=\dfrac{27,2}{212,6}.100\%\approx12,79\%\)

a, \(n_{H_2}=\dfrac{4,48}{22,4}=0,2\left(mol\right)\)

Zn + 2HCl -----> ZnCl₂ + H₂

0,2     0,4               0,2     0,2

b, \(m_{Zn}=0,2.65=13\left(g\right)\)

\(m_{HCl}=0,4.36,5=14,6\left(g\right)\)

c, \(m_{ZnCl_2}=0,2.136=27,2\left(g\right)\)

\(a,n_{H_2}=\dfrac{4,48}{22,4}=0,2\left(mol\right)\)

PTHH: Zn + 2HCl ---> ZnCl₂ + H₂

         0,2<--0,4<--------0,2<---0,2

\(b,\left\{{}\begin{matrix}m_{Zn}=0,1.65=13\left(g\right)\\m_{HCl}=0,4.36,5=14,6\left(g\right)\end{matrix}\right.\\ c,m_{ZnCl_2}=0,2.136=27,2\left(g\right)\)

\(a.Zn+2HCl\rightarrow ZnCl_2+H_2\\ b.n_{Zn}=n_{ZnCl_2}=0,1\left(mol\right)\\ \Rightarrow m_{ZnCl_2}=0,1.136=13,6\left(g\right)\\ c.n_{H_2}=n_{Zn}=0,1\left(mol\right)\\ \Rightarrow V_{H_2}=0,1.22,4=2,24\left(l\right)\)