Zn + 2HCl --> ZnCl2 + H2

0,5      1              0,5       0,5

nZn=\(\dfrac{32,5}{65}\)=0,5(mol)

mZnCl2=0,5.136=68(g)

VH2=0,5.22,4=11,2(l)

c) CM HCl=\(\dfrac{1}{0,25}=4M\)

\(a) Zn + 2HCl \to ZnCl_2 + H_2\\ n_{ZnCl_2} = n_{Zn} = \dfrac{6,5}{65} = 0,1(mol)\\ m_{ZnCl_2} = 0,1.136 = 13,6(gam)\\ b) n_{H_2} = n_{Zn} = 0,1(mol) \Rightarrow V_{H_2} = 0,1.22,4 =2 ,24(lít)\\ c) n_{HCl} =2 n_{H_2} = 0,2(mol)\\ \Rightarrow m_{HCl} = 0,2.36,5 = 7,3(gam)\ ; V_{dd\ HCl} = \dfrac{0,2}{0,5} = 0,4(lít)\)

a,\(n_{Fe}=\dfrac{11,2}{56}=0,2\left(mol\right);n_{H_2}=\dfrac{3,36}{22,4}=0,15\left(mol\right)\)

PTHH: Fe + 2HCl → FeCl₂ + H₂

Mol:    0,15     0,3

Ta có: \(\dfrac{0,2}{1}>\dfrac{0,15}{1}\) ⇒ H₂ pứ hết,Fe dư

\(V_{H_2}=3,36\left(l\right)\) (đề cho)

b, ko tính đc k/lg dd ,chỉ tính đc thể tích dd

\(V_{ddHCl}=\dfrac{0,2}{1}=0,2\left(l\right)=200\left(ml\right)\)

\(a,Zn+2HCl\rightarrow ZnCl_2+H_2\\ n_{ZnCl_2}=n_{H_2}=n_{Zn}=\dfrac{6,5}{65}=0,1\left(mol\right)\\ b,m_{ZnCl_2}=136.0,1=13,6\left(g\right);V_{H_2\left(đktc\right)}=0,1.22,4=2,24\left(l\right)\\ c,Vì:\dfrac{0,1}{1}>\dfrac{0,2}{1}\Rightarrow n_{Zn\left(TT\right)}=0,1\left(mol\right);n_{Zn\left(LT\right)}=n_{ZnCl_2}=0,2\left(mol\right)\\ H=\dfrac{0,1}{0,2}.100\%=50\%\)

a/ Fe + 2HCl \(\rightarrow\) FeCl₂ + H₂

n_H2 = \(\dfrac{3,36}{22,4}=0,15\left(mol\right)\)

Theo PTHH: n_H2 = n_Fe = 0,15 (mol) \(\Rightarrow m_{Fe}=0,15.56=8,4\left(g\right)\)

\(\Rightarrow m_{Cu}=11-8,4=2,6\left(g\right)\)

\(\Rightarrow\%m_{Fe}=\dfrac{8,4}{11}.100\%\approx76,4\%\)

\(\Rightarrow\%m_{Cu}=100-76,4\approx23,6\%\)

b/ Theo PTHH ta có: n_HCl = 2n_Fe = 2.0,15 = 0,3 (mol)

\(\Rightarrow V_{ddHCl}=\dfrac{0,3}{2}=0,15\left(M\right)\)

c/ m_HCl = 36,5 . 0,3 = 10,95(g)

\(\Rightarrow C\%_{HCl}=\dfrac{m_{HCl}}{m_{ddHCl}}.100\%=\dfrac{10,95}{200}.100\%=5,475\%\)

a, PT: \(Fe+2HCl\rightarrow FeCl_2+H_2\)

Ta có: \(n_{H_2}=\dfrac{3,36}{22,4}=0,15\left(mol\right)\)

Theo PT: \(n_{Fe}=n_{H_2}=0,15\left(mol\right)\)

\(\Rightarrow\left\{{}\begin{matrix}\%m_{Fe}=\dfrac{0,15.56}{11}.100\%\approx76,36\%\\\%m_{Cu}\approx23,64\%\end{matrix}\right.\)

b, Theo PT: \(n_{HCl}=2n_{H_2}=0,3\left(mol\right)\)

\(\Rightarrow V_{ddHCl}=\dfrac{0,3}{2}=0,15\left(l\right)\)

c, \(C\%_{HCl}=\dfrac{0,3.36,5}{200}.100\%=5,475\%\)

a) PTHH : \(Fe+2HCl-->FeCl_2+H_2\)

b) \(n_{Fe}=\dfrac{5,6}{56}=0,1\left(mol\right)\)

Theo PTHH : n_H2 = n_Fe = 0,1 (mol)

=> V_H2 = \(0,1.22,4=2,24\left(l\right)\)

c) Theo PTHH : \(n_{HCl\left(pu\right)}=2n_{Fe}=0,2\left(mol\right)\)

=> m_HCl = 0,2.36,5 = 7,3 (g)

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

\(Zn+2HCl\rightarrow ZnCl_2+H_2\uparrow\) 
   1       2           1        1    (mol)

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

b) Thể tích khí hidro:

V = n.22,4 = 0,2.22,4 = 4,48 (l)

c) Khối lượng muối tạo thành:

\(m_{ZnCl_2}=n.M=0,2.\left(65+35,5.2\right)=27,2\left(g\right)\)

d) \(m_{ctHCl}=n.M=0,4.\left(1+35,5\right)=14,6\left(g\right)\)

\(C\%_{HCl}=\dfrac{m_{ctHCl}}{m_{ddHCl}}.100\%=\dfrac{14,6}{200}.100\%=7,3\%\)

a) Zn + 2HCl → ZnCl₂ + H₂↑

b) 

\(a,Fe+2HCl\rightarrow FeCl_2+H_2\\ CuO+2HCl\rightarrow CuCl_2+H_2O\\ n_{H_2}=\dfrac{2,24}{22,4}=0,1\left(mol\right)\Rightarrow n_{Fe}=n_{H_2}=0,1\left(mol\right)\\ \Rightarrow\%m_{Fe}=\dfrac{0,1.56}{13,6}.100\%\approx41,176\%\\ \Rightarrow\%m_{CuO}\approx58,824\%\\ b,n_{CuO}=\dfrac{13,6-0,1.56}{80}=0,1\left(mol\right)\\ n_{HCl\left(p.ứ\right)}=2.\left(n_{Fe}+n_{CuO}\right)=2.\left(0,1+0,1\right)=0,4\left(mol\right)\\ \Rightarrow V_{ddHCl}=\dfrac{0,4}{2}=0,2\left(l\right)\)