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\(n_{CaCl_2}=\dfrac{22.2}{111}=0.2\left(mol\right)\)

\(CaCl_2+2AgNO_3\rightarrow Ca\left(NO_3\right)_2+2AgCl\)

\(0.2....................................................0.4\)

\(m_{AgCl}=0.4\cdot143.5=57.4\left(g\right)\)

n_CaCl2=22,2/111=0,2(mol)

CaCl₂ + 2AgNO₃ -----> 2AgCl + Ca(NO₃)₂

TPT:n_AgCl=2.n_CaCl2=2.0,2=0,4(mol)

m_AgCl=0,4.143,5=57,4(g)

\(Fe + 2HCl \to FeCl_2 + H_2\\ n_{Fe} = n_{FeCl_2} = n_{H_2} = \dfrac{8,96}{22,4} = 0,4(mol)\\ m_{Fe} = 0,4.56 = 22,4(gam)\\ m_{FeCl_2} = 0,4.127 = 50,8(gam)\)

\(n_{H_2}=\dfrac{8.96}{22.4}=0.4\left(mol\right)\)

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

\(n_{Fe}=n_{FeCl_2}=n_{H_2}=0.4\left(mol\right)\)

\(m_{Fe}=0.4\cdot56=22.4\left(g\right)\)

\(m_{FeCl_2}=0.4\cdot127=50.8\left(g\right)\)

a) PTHH : Fe + 2HCl → FeCl₂ + H₂

b) V_H2(đktc)=8,96(l) → n_H2= \(\dfrac{8,96}{22,4}\)=0,4(mol)

→ n_Fe= 0,4(mol)

m_Fe= 0,4 . 56=22,4(g)

c) Ta có :  n_H2= \(\dfrac{8,96}{22,4}\)=0,4(mol) → n_FeCl2= 0,4(mol)

m_FeCl2= 0,4 . 127=50,8(g)

mHCl= 3,65%.400= 14,6(g) => nHCl=14,6/36,5=0,4(mol)

a) PTHH: Mg +2 HCl -> MgCl2 + H2

0,2__________0,4_____0,2____0,2(mol)

V(H2,đktc)=0,2.22,4=4,48(l)

b)mMg=0,2.24=4,8(g)

c) mMgCl2= 0,2.95=19(g)

mddMgCl2= 400+4,8 - 0,2.2= 404,4(g)

=> C%ddMgCl2= (19/404,4).100=4,698%

\(m_{NaOH}=\dfrac{200\cdot8}{100}=16\left(g\right)\Rightarrow n_{NaOH}=\dfrac{16}{40}=0,4mol\)

\(NaOH+HCl\rightarrow NaCl+H_2O\)

 0,4           0,4         0,4        0,4

a)\(m_{HCl}=0,4\cdot36,5=14,6\left(g\right)\) 

 \(\Rightarrow m_{ddHCl}=\dfrac{14,6}{7,3}\cdot100=200\left(g\right)\)

b)\(m_{NaCl}=0,4\cdot58,5=23,4\left(g\right)\)

   \(m_{H_2O}=0,4\cdot18=7,2\left(g\right)\)

   \(m_{ddsau}=200+200-7,2=392,8\left(g\right)\)

   \(\Rightarrow C\%=\dfrac{23,4}{392,8}\cdot100=5,96\%\)

c) \(n_{SO_2}=\dfrac{6,72}{22,4}=0,3mol\)

     \(2NaOH+SO_2\rightarrow Na_2SO_4+H_2O\)

         0,4          0,3         0,3              0,3

     \(m_{Na_2SO_4}=0,3\cdot142=42,6\left(g\right)\)

a,\(n_{H_2}=\dfrac{2,24}{22,4}=0,1\left(mol\right)\)
PTHH: Fe + 2HCl → FeCl₂ + H₂

Mol:     0,1    0,2                             0,1

b,\(m_{Fe}=0,1.56=5,6\left(g\right)\)

\(\Rightarrow\%m_{Fe}=\dfrac{5,6.100\%}{12}=46,67\%;\%m_{Cu}=100-46,67=53,33\%\)

c,\(m_{HCl}=0,2.36,5=7,3\left(g\right)\Rightarrow m_{ddHCl}=\dfrac{7,3.100}{14,6}=50\left(g\right)\)

\(n_{H_2}=\dfrac{14,874}{24,79}=0,6\left(mol\right)\)

PT: \(Fe+2HCl\rightarrow FeCl_2+H_2\)

        0,6        1,2                    0,6 (mol)

a, m_Fe = 0,6.56 = 33,6 (g)

b, m_HCl = 1,2.36,5 = 43,8 (g)

\(a,n_{H_2}=\dfrac{14,874}{24,79}=0,6mol\\ Fe+2HCl\rightarrow FeCl_2+H_2\\ n_{H_2}=n_{Fe}=0,6mol\\ m_{Fe}=0,6.56=33,6g\\ b.n_{HCl}=0,6.2=1,2mol\\ m_{HCl}=1,2.36,5=43,8g\)