a) \(\left\{{}\begin{matrix}n_{Fe}=\dfrac{11,2}{56}=0,2\left(mol\right)\\n_{HCl}=\dfrac{10,95}{36,5}=0,3\left(mol\right)\end{matrix}\right.\)

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

Xét tỉ lệ: \(0,2>\dfrac{0,3}{2}\Rightarrow\) Fe dư

Theo PTHH: \(n_{Fe\left(p\text{ư}\right)}=n_{H_2}=\dfrac{1}{2}n_{HCl}=0,15\left(mol\right)\)

\(\Rightarrow m_{Fe\left(d\text{ư}\right)}=\left(0,2-0,15\right).56=2,8\left(g\right)\)

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

nZn= 13/65=0,2(mol)

a) PTHH: Zn +  2 HCl -> ZnCl2 + H2

b) nH2=nZnCl2=nZn=0,2(mol)

=>V(H2,đktc)=0,2 x 22,4= 4,48(l)

c) khối lượng muối sau phản ứng chứ nhỉ? 

mZnCl2=136.0,2=27,2(g)

\(n_{Mg}=\dfrac{3}{24}=0,125mol\)

\(n_{HCl}=\dfrac{10,95}{36,5}=0,3mol\)

\(Mg+2HCl\rightarrow MgCl_2+H_2\)

0,125 <  0,3                              ( mol )

0,125                                   0,125   ( mol )

\(V_{H_2}=0,125.22,4=2,8l\)

a) \(PTHH:Mg+2HCl\rightarrow MgCl_2+H_2\) 

b) \(n_{Mg}=\dfrac{4,8}{24}=0,2mol\) 

\(n_{HCl}=2.n_{Mg}=0,2.2=0,4mol\)

\(\Rightarrow m_{HCl}=n.M=0,4.36,5=14,6g\)

c) \(n_{H_2}=n_{Mg}=0,2mol\) 

Thể tích khí hidro sinh ra (ở đktc): 

\(V_{H_2}=0,2.24,79=4,958l.\)

a. \(PTHH:Mg+2HCl\rightarrow MgCl_2+H_2\uparrow\)

\(n_{Mg}=\dfrac{m_{Mg}}{M_{Mg}}=\dfrac{12}{24}=0,5\left(mol\right)\)

- Mol theo PTHH : \(1:2:1:1\)

- Mol theo phản ứng : \(0,5\rightarrow1\rightarrow0,5\rightarrow0,5\)

\(\Rightarrow n_{H_2}=0,5\left(mol\right)\)

\(\Rightarrow V_{H_2}=n_{H_2}.22,4=0,5.22,4=11,2\left(l\right)\)

b. Từ a. \(\Rightarrow n_{HCl}=1\left(mol\right)\)

\(\Rightarrow m_{HCl}=n_{HCl}.M_{HCl}=1.\left(1+35,5\right)=36,5\left(g\right)\)

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

\(PTHH:2H_2+O_2\underrightarrow{t^o}2H_2O\)

- Mol theo PTHH : \(2:1:2\)

- Mol theo phản ứng : \(0,6\leftarrow0,3\rightarrow0,6\)

\(\Rightarrow n_{H_2O}=0,6\left(mol\right)\)

\(\Rightarrow m_{H_2O}=n_{H_2O}.M_{H_2O}=0,6.\left(2+16\right)=10,8\left(g\right)\)

a.b.\(n_{Mg}=\dfrac{3,6}{24}=0,15mol\)

\(Mg+2HCl\rightarrow MgCl_2+H_2\)

0,15    0,3                          0,15  ( mol )

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

\(m_{HCl}=0,3.36,5=10,95g\)

c.\(n_{H_2}=0,15.60\%=0,09mol\)

\(Ag_2O+H_2\rightarrow\left(t^o\right)2Ag+H_2O\)

            0,09            0,18             ( mol )

\(m_{Ag}=0,18.108=19,44g\)

\(a.n_{Mg}=\dfrac{3,6}{24}=0,15\left(mol\right)\\ Mg+2HCl\rightarrow MgCl_2+H_2\\ TheoPT:n_{H_2}=n_{Mg}=0,15\left(mol\right)\\ \Rightarrow V_{H_2}=0,15.22,4=3,36\left(l\right)\\ b.TheoPT:n_{HCl}=2n_{Mg}=0,3\left(mol\right)\\ \Rightarrow m_{Mg}=0,3.36,5=10,95\left(g\right)\\ c.n_{H_2\left(pứ\right)}=0,15.60\%=0,054\left(g\right)\\ H_2+Ag_2O-^{t^o}\rightarrow2Ag+H_2O\\ n_{Ag}=2n_{H_2}=0,108\left(mol\right)\\ \Rightarrow m_{Ag}=0,108.108=11,664\left(g\right)\)

\(a,PTHH:Mg+2HCl\rightarrow MgCl_2+H_2\\ b,n_{Mg}=\dfrac{4,8}{24}=0,2\left(mol\right)\\ \Rightarrow n_{MgCl_2}=0,2\left(mol\right)\\ \Rightarrow m_{MgCl_2}=0,2\cdot95=19\left(g\right)\\ c,n_{H_2}=0,2\left(mol\right)\\ \Rightarrow V_{H_2\left(đktc\right)}=0,2\cdot22,4=4,48\left(l\right)\)

nFe = 16,8/56 = 0,3 (mol)

PTHH: Fe + 2HCl -> FeCl2 + H2

Mol: 0,3 ---> 0,6 ---> 0,3 ---> 0,3

VH2 = 0,3 . 24,79 = 7,437 (l)

mHCl = 0,6 . 36,5 = 21,9 (g)

PTHH: CuO + H2 -> (t°) Cu + H2O

Mol: 0,3 <--- 0,3 ---> 0,3

mCu = 0,3 . 64 = 19,2 (g)

mFe = 16,8: 56 =0,3(mol) 
pthh : Fe + 2HCl --> FeCl2 + H2 (1)
         0,3 ->0,6-----------------> 0,3 (mol) 
=> VH2 (đkc) = 0,3 . 24,79 ( l) 
=> mHCl = 0,6 . 35,5 = 21,9 (g) 
pthh : CuO + H2 -t--> Cu+ H2O
           0,3<-----0,3 (mol) 
=>mCu = 0,3 . 64 = 19,2 (g)

 

\(n_{Fe}=\dfrac{16,8}{56}=0,3mol\)

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

0,3    0,6          0,3          0,3

\(V_{H_2}=0,3\cdot22,4=6,67l\)

\(m_{HCl}=0,6\cdot36,5=21,9g\)

\(CuO+H_2\rightarrow Cu+H_2O\)

0,3       0,3       0,3

\(m_{Cu}=0,3\cdot64=19,2g\)

a) Mg + 2HCl --> MgCl₂ + H₂

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

PTHH: Mg + 2HCl --> MgCl₂ + H₂

_____0,2--->0,4--------------->0,2

=> m_HCl = 0,4.36,5 = 14,6 (g)

c) V_H2 = 0,2.22,4 = 4,48 (l)