\(a,n_{Zn}=\dfrac{0,65}{65}=0,01\left(mol\right)\)

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

          0,01--->0,02---->0,01---->0,01

\(V_{H_2}=0,01.22,4=0,224\left(l\right)\\ b,m_{ZnCl_2}=0,01.136=1,36\left(g\right)\\ V_{ddHCl}=\dfrac{0,02}{2}=0,01\left(l\right)\)

a)

$Zn + H_2SO_4 \to ZnSO_4 + H_2$
Theo PTHH : 

$n_{H_2} = n_{ZnSO_4} = n_{H_2SO_4} = n_{Zn} = \dfrac{21,6}{65} = 0,33(mol)$
$V_{H_2} = 0,33.22,4 = 7,392(lít)$
b)

$m_{ZnSO_4} = 0,33.161 = 53,13(gam)$
c)

$V_{H_2SO_4} = \dfrac{0,33}{2} = 0,165(lít)$

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

PTHH: 2Al + 6HCl --> 2AlCl₃ + 3H₂

______0,2-->0,6--------------->0,3

=> m_HCl = 0,6.36,5 = 21,9 (g) 

b) V_H2 = 0,3.22,4 = 6,72 (l)

nAl=5,427=0,2(mol)���=5,427=0,2(���)

PTHH: 2Al + 6HCl --> 2AlCl₃ + 3H₂

______0,2-->0,6--------------->0,3

=> m_HCl = 0,6.36,5 = 21,9 (g) 

b) V_H2 = 0,3.22,4 = 6,72 (l)

$PTHH:Zn+2HCl\to ZnCl_2+H_2\uparrow$

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

Theo PT: $n_{ZnCl_2}=n_{H_2}=0,2(mol);n_{HCl}=0,4(mol)$

$a)m_{axit}=m_{HCl}=n.M=0,4.36,5=14,6(g)$

$b)m_{ZnCl_2}=n.M=0,2.136=27,2(g)$

$c)V_{H_2(đktc)}=n.22,4=0,2.22,4=4,48(lít)$

Số mol kẽm là : 

\(n=\dfrac{m}{M}=\dfrac{13}{65}=0,2\left(mol\right)\)

PTHH : Zn + 2HCL -> ZnCl₂ + H₂

1 2 1 1 

0,2 mol -> 0,4 mol 0,2 mol 0,2 mol 

a, Khối lượng HCL là : 

\(m=n.M=0,4.35,5=14,2\left(g\right)\)

b, Khối lượng ZnCL₂ là : 

\(m=n.M=0,1.136=13,6\left(g\right)\)

c, Thể tích H₂ là : V = n . 22,4 = \(0,1.22,4=2,24\left(l\right)\)

PTHH: \(2Al+3H_2SO_4\rightarrow Al_2\left(SO_4\right)_3+3H_2\uparrow\)

Ta có: \(\left\{{}\begin{matrix}n_{Al}=\dfrac{4,05}{27}=0,15\left(mol\right)\\n_{H_2SO_4}=\dfrac{294\cdot10\%}{98}=0,3\left(mol\right)\end{matrix}\right.\)

Xét tỉ lệ: \(\dfrac{0,15}{2}< \dfrac{0,3}{3}\) \(\Rightarrow\) Axit còn dư

\(\Rightarrow\left\{{}\begin{matrix}n_{Al_2\left(SO_4\right)_3}=0,075\left(mol\right)=n_{H_2SO_4\left(dư\right)}\\n_{H_2}=0,225\left(mol\right)\end{matrix}\right.\) \(\Rightarrow\left\{{}\begin{matrix}V_{H_2}=0,225\cdot22,4=5,04\left(l\right)\\m_{Al_2\left(SO_4\right)_3}=0,075\cdot342=25,65\left(g\right)\\m_{H_2SO_4\left(dư\right)}=0,075\cdot98=7,35\left(g\right)\\m_{H_2}=0,225\cdot2=0,45\left(g\right)\end{matrix}\right.\)

Mặt khác: \(m_{dd}=m_{Al}+m_{ddH_2SO_4}-m_{H_2}=297,6\left(g\right)\)

\(\Rightarrow\left\{{}\begin{matrix}C\%_{Al_2\left(SO_4\right)_3}=\dfrac{25,65}{297,6}\cdot100\%\approx8,62\%\\C\%_{H_2SO_4\left(dư\right)}=\dfrac{7,35}{297,6}\cdot100\%\approx4,47\%\end{matrix}\right.\)

1////          nAl=0,4mol   

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

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

a/ V_H2=0,6.22,4=13,44 l

b/ V=1,2/2=0,6 l

C_AlCl3=0,4/0,6=2/3 M

Câu 2: 

\(n_{O_2}=\dfrac{6,72}{22,4}=0,3\left(mol\right)\)

PTHH: \(2KMnO_4\xrightarrow[]{t^o}K_2MnO_4+MnO_2+O_2\)

               0,6<------------------------------------0,3

\(\Rightarrow m_{KMnO_4}=0,6.158=94,8\left(g\right)\)

Câu 3: 

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

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

             0,2<-----------------------0,2

=> m_Zn = 0,2.65 = 13 (g)

Câu 4:

\(n_{Fe}=\dfrac{22,4}{56}=0,4\left(mol\right)\)

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

           0,4------------------------->0,4

             \(CuO+H_2\xrightarrow[]{t^o}Cu+H_2O\)

              0,4<---0,4

\(\Rightarrow m_{CuO}=0,4.80=32\left(g\right)\)

PT: Fe2O3+3H2to→2Fe+3H2O

CuO+H2to→Cu+H2O

a, Ta có:  mFe2O3=20.60%=12(g)

⇒nFe2O3=\(\dfrac{12}{160}\)=0,075(mol

mCuO=20−12=8(g

⇒nCuO=\(\dfrac{8}{80}\)=0,1(mol)

Theo pT: 

nFe=2nFe2O3=0,15(mol)

nCu=nCuO=0,1(mol)

⇒mFe=0,15.56=8,4(g)

mCu=0,1.64=6,4(g)

b, Theo PT: nH2=3nFe2O3+nCuO=0,325(mol)

⇒VH2=0,325.22,4=7,28(l)

c. Zn+2HCl->ZnCl2+H2

               0,65----------0,325

=>m HCl=0,65.36,5=23,725g

Ủa bạn cái câu a . 20x60% ( 20 ở đâu vậy bạn

\(a.PTHH:Zn+2HCl\xrightarrow[]{}ZnCl_2+H_2\\ b.n_{Zn}=\dfrac{13}{65}=0,2\left(mol\right)\\ PTHH:Zn+2HCl\xrightarrow[]{}ZnCl_2+H_2\\ n_{H_2}=0,2.2=0,4\left(mol\right)\\ V_{H_2}=0,4.22,4=8,96\left(l\right)\\ c.n_{HCl}=n_{Zn}=0,2mol\\ C_{MHCl}=\dfrac{0,4}{0,1}=4\left(M\right)\)

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

PTHH :

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

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

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

\(c,C_M=\dfrac{n}{V}=\dfrac{0,4}{0,1}=4M\)