\(a) n_{SO_2} = \dfrac{3,36}{22,4} = 0,15(mol) ; n_{NaOH} = 0,15.2 = 0,3(mol)\\ \dfrac{n_{NaOH}}{n_{SO_2}} = \dfrac{0,3}{0,15} = 2\)

Suy ra muối tạo thành là Na₂SO₃

\(b) n_{SO_2}= \dfrac{6,4}{32} = 0,2(mol) ; n_{NaOH} = 0,05.1 = 0,05(mol)\\ \dfrac{n_{NaOH}}{n_{SO_2}} = \dfrac{0,05}{0,2} = 0,25 <1\)

Suy ra muối tạo thành là NaHSO₃

\(c) n_{SO_2} = \dfrac{4,48}{22,4} = 0,2(mol) ; n_{NaOH} = 0,1(mol)\\ \dfrac{n_{NaOH}}{n_{SO_2} }=\dfrac{0,1}{0,2} = 0,5 <1\)

Suy ra muối tạo thành là Na₂SO₃

a) Ta có: \(\left\{{}\begin{matrix}n_{SO_2}=\dfrac{3,36}{22,4}=0,15\left(mol\right)\\n_{NaOH}=2\cdot0,15=0,3\left(mol\right)\end{matrix}\right.\) \(\Rightarrow\) Tạo muối trung hòa

PTHH: \(2NaOH+SO_2\rightarrow Na_2SO_3+H_2O\)

Các phần còn lại thì tương tự, bạn dựa vào hình dưới để làm nhé !

*P/s: Thay CO₂ bằng SO₂

\(n_{H_2S}=\dfrac{2,24}{22,4}=0,1\left(mol\right)\)

\(n_{NaOH}=0,15.1=0,15\left(mol\right)\)

Xét tỉ lệ: \(\dfrac{n_{NaOH}}{n_{H_2S}}=\dfrac{0,15}{0,1}=1,5\)

=> Tạo ra 2 muối Na₂S, NaHS

PTHH: 2NaOH + H₂S --> Na₂S + 2H₂O

                a------>0,5a---->0,5a

            NaOH + H₂S --> NaHS + H₂O

               b----->b-------->b

=> \(\left\{{}\begin{matrix}a+b=0,15\\0,5a+b=0,1\end{matrix}\right.\)

=> a = 0,1 (mol); b = 0,05 (mol)

=> \(\left\{{}\begin{matrix}m_{Na_2S}=0,05.78=3,9\left(g\right)\\m_{NaHS}=0,05.56=2,8\left(g\right)\end{matrix}\right.\)

\(\left\{{}\begin{matrix}C_{M\left(Na_2S\right)}=\dfrac{0,05}{0,15}=0,33M\\C_{M\left(NaHS\right)}=\dfrac{0,05}{0,15}=0,33M\end{matrix}\right.\)

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

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

 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

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

PTHH: \(2NaOH+CO_2\rightarrow Na_2CO_3+H_2O\)

a) \(n_{CO_2}=\dfrac{V}{22,4}=\dfrac{3,36}{22,3}=0,15\left(mol\right)\)

\(\Rightarrow n_{NaOH}=2n_{CO_2}=0,3\left(mol\right)\)

\(C_{M_{ddNaOH}}=\dfrac{n}{V}=\dfrac{0,3}{0,3}=1M\)

b) \(n_{Na_2CO_3}=n_{CO_2}=0,15\left(mol\right)\)

\(m_{Na_2CO_3}=n.M=0,15.106=15,9\left(g\right)\)

Ta có: \(n_{H_2}=\dfrac{10,08}{22,4}=0,45\left(mol\right)\)

PT: \(Fe+2HCl\rightarrow FeCl_2+H_2\)

a, \(n_{Fe}=n_{H_2}=0,45\left(mol\right)\Rightarrow m_{Fe}=0,45.56=25,2\left(g\right)\)

b, \(n_{HCl}=2n_{H_2}=0,9\left(mol\right)\) \(\Rightarrow C_{M_{HCl}}=\dfrac{0,9}{0,15}=6\left(M\right)\)

c, \(FeCl_2+2NaOH\rightarrow Fe\left(OH\right)_2+2NaCl\)

\(4Fe\left(OH\right)_2+O_2\underrightarrow{t^o}2Fe_2O_3+4H_2O\)

Theo PT: \(n_{Fe_2O_3}=\dfrac{1}{2}n_{Fe\left(OH\right)_2}=\dfrac{1}{2}n_{FeCl_2}=\dfrac{1}{2}n_{H_2}=0,225\left(mol\right)\)

\(\Rightarrow m_{Fe_2O_3}=0,225.160=36\left(g\right)\)

`n_[SO_2]=[2,24]/[22,4]=0,1(mol)`

`n_[NaOH]=0,1.0,5=0,05(mol)`

Có:`T=[0,05]/[0,1]=0,5`

   `=>` Tạo muối `Na_2 SO_3`

\(n_{SO_2} = \dfrac{3,36}{22,4} = 0,15(mol) ; n_{NaOH} = \dfrac{200.4\%}{40} =0,2(mol)\\ \dfrac{n_{NaOH}}{n_{SO_2}} =\dfrac{0,2}{0,15} = 1,3 \to \text{Muối tạo thành} : Na_2SO_3(a\ mol) ; NaHSO_3(b\ mol)\\ 2NaOH + SO_2 \to Na_2SO_3 + H_2O\\ NaOH + SO_2 \to NaHSO_3\\ n_{NaOH} = 2a + b = 0,2(mol)\\ n_{SO_2} =a + b = 0,15(mol)\\ \Rightarrow a = 0,05 ; b = 0,1\\ m_{Na_2SO_3} = 0,05.126 = 6,3(gam)\\ m_{NaHSO_3} = 0,1.104 = 10,4(gam)\)

nSO2 = 3,36/22,4=0,15 mol

nNaOH=4*0,2=0,8 mol

2NaOH + SO2--> Na2SO3 + H2O 

                 0,15       0,15             mol

ta thấy nNaOH/2=0,4 > NSO2/1=0,15

=> nNa2SO4=0,15 => mNa2SO4=0,15*142=21,3 g