Ta có: \(n_{Na_2SO_3}=\dfrac{12,6}{126}=0,1\left(mol\right)\)

a. PTHH: Na₂SO₃ + 2HCl ---> 2NaCl + SO₂ + H₂O

Theo PT: \(n_{SO_2}=n_{Na_2CO_3}=0,1\left(mol\right)\)

=> \(V_{SO_2}=0,1.22,4=2,24\left(lít\right)\)

b. Theo PT: \(n_{HCl}=2.n_{SO_2}=2.0,1=0,2\left(mol\right)\)

=> \(m_{HCl}=0,2.36,5=7,3\left(g\right)\)

=> \(C_{\%_{HCl}}=\dfrac{7,3}{150}.100\%=4,87\%\)

c. Ta có: \(m_{dd_{NaCl}}=n_{Na_2SO_{3_{PỨ}}}=50\left(g\right)\)

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

=> \(m_{NaCl}=0,2.58,5=11,7\left(g\right)\)

=> \(C_{\%_{NaCl}}=\dfrac{11,7}{50}.100\%=23,4\%\)

\(n_K=\dfrac{9,75}{39}=0,25\left(mol\right)\)

\(n_{HCl}=\dfrac{300.7,3\%}{36,5}=0,6\left(mol\right)\)

PTHH: 2K + 2HCl --> 2KCl + H₂

Xét tỉ lệ: \(\dfrac{0,25}{2}< \dfrac{0,6}{2}\) => HCl dư

PTHH: 2K + 2HCl --> 2KCl + H₂

          0,25-->0,25-->0,25-->0,125

=> V_H2 = 0,125.22,4 = 2,8 (l)

m_KCl = 0,25.74,5 = 18,625 (g)

m_{dd sau pư} = 9,75 + 300 - 0,125.2 = 309,5 (g)

m_HCl(dư) = (0,6 - 0,25).36,5 = 12,775 (g)

\(\left\{{}\begin{matrix}C\%_{KCl}=\dfrac{18,625}{309,5}.100\%=6,018\%\\C\%_{HCl}=\dfrac{12,775}{309,5}.100\%=4,128\%\end{matrix}\right.\)

`a)PTPƯ: Zn + 2HCl -> ZnCl_2 + H_2↑`

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`b) n_[Zn] = 13 / 65 = 0,2 (mol)`

Theo `PTPƯ` có: `n_[HCl] = 2n_[Zn] = 2 . 0,2 = 0,4 (mol)`

  `-> m_[dd HCl] = [ 0,4 . 36,5 ] / [ 7,3 ] . 100 = 200 (g)`

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`c)` Theo `PTPƯ` có: `n_[H_2] = n_[ZnCl_2] = n_[Zn] = 0,2 (mol)`

`-> C%_[ZnCl_2] = [ 0,2 . 136 ] / [ 13 + 200 - 0,2 . 2 ] . 100 ~~ 12,79 %`

\(n_{Na_2SO_3}=\dfrac{25,2}{126}=0,2(mol)\\ n_{HCl}=\dfrac{250.7,3\%}{100\%.36,5}=0,5(mol)\\ PTHH:Na_2SO_3+2HCl\to 2NaCl+H_2O+SO_2\uparrow\)

Vì \(\dfrac{n_{Na_2SO_3}}{1}<\dfrac{n_{HCl}}{2}\) nên \(HCl\) dư

\(a,n_{SO_2}=n_{Na_2SO_3}=0,2(mol)\\ \Rightarrow V_{SO_2}=0,2.22,4=4,48(l)\)

\(b,\) Chất tan trong dd sau phản ứng là \(NaCl\)

\(c,n_{NaCl}=2n_{Na_2SO_3}=0,4(mol)\\ \Rightarrow m_{NaCl}=0,4.58,5=23,4(g)\)

Câu trên mình sai nha

\(n_{Na_2SO_3}=\dfrac{25,2}{126}=0,2(mol)\\ n_{HCl}=\dfrac{250.7,3\%}{100\%.36,5}=0,5(mol)\\ PTHH:Na_2SO_3+2HCl\to 2NaCl+H_2O+SO_2\uparrow\)

Vì \(\dfrac{n_{Na_2SO_3}}{1}<\dfrac{n_{HCl}}{2}\) nên \(HCl\) dư

\(a,n_{SO_2}=n_{Na_2SO_3}=0,2(mol)\\ \Rightarrow V_{SO_2}=0,2.22,4=4,48(l)\)

\(b,\) Chất tan trong dd sau phản ứng gồm \(HCl\) dư và \(NaCl\)

\(c,n_{HCl(dư)}=0,5-0,2.2=0,1(mol);n_{NaCl}=0,4(mol)\\ \Rightarrow m_{\text{dd sau p/ứ}}=m_{HCl(dư)}+m_{NaCl}=0,1.36,5+0,4.58,5=27,05(g)\)

Na2SO3+2HCl->2NaCl+H2O+SO2

0,201-------0,402------0,402---------------0.201

n Na2SO3=0,201 mol

m HCl=18,25 g

->n HCl=0,5 mol

=>HCl dư

=>VSO2=0,201.22,4=4,5024l

b)

mNaCl=\(\dfrac{0,402.58,5}{25,4+250-0,201.64}\).100=8,95%

m Hcl dư=\(\dfrac{0,098.36,5}{25,4+250-0,201.64}.100=1,36\%\)

\(n_{Na_2SO_3}=\dfrac{12,6}{126}=0,1\left(mol\right)\\ 1,PTHH:Na_2SO_3+2HCl\rightarrow2NaCl+H_2O+SO_2\uparrow\\ \Rightarrow n_{HCl}=2n_{Na_2SO_3}=0,2\left(mol\right)\\ \Rightarrow m_{CT_{HCl}}=0,2\cdot36,5=7,3\left(g\right)\\ \Rightarrow m_{dd_{HCl}}=\dfrac{7,3}{20\%}=36,5\left(g\right)\\ 2,n_{H_2O}=n_{SO_2}=0,1\left(mol\right);n_{NaCl}=0,2\left(mol\right)\\ \Rightarrow\left\{{}\begin{matrix}m_{H_2O}=0,1\cdot18=1,8\left(g\right)\\m_{SO_2}=0,1\cdot64=6,4\left(g\right)\\m_{CT_{NaCl}}=0,2\cdot58,5=11,7\left(g\right)\end{matrix}\right.\\ \Rightarrow m_{dd_{NaCl}}=12,6+36,5-1,8-6,4=40,9\left(g\right)\\ \Rightarrow C\%_{NaCl}=\dfrac{11,7}{40,9}\cdot100\%\approx28,61\%\)

Làm sao ạ

\(n_{NaOH}=\dfrac{150.20\%}{40}=0,75\left(mol\right)\\ n_{HCl}=\dfrac{250.7,3\%}{36,5}=0,5\left(mol\right)\\ NaOH+HCl\rightarrow NaCl+H_2O\\ Vì:\dfrac{0,75}{1}>\dfrac{0,5}{1}\Rightarrow NaOHdư\\ \Rightarrow n_{NaOH\left(p.ứ\right)}=n_{NaCl}=n_{HCl}=0,5\left(mol\right)\\ n_{NaOH\left(dư\right)}=0,75-0,5=0,25\left(mol\right)\\ C\%_{ddNaCl}=\dfrac{58,5.0,5}{150+250}.100=7,3125\%\\ C\%_{ddNaOH\left(dư\right)}=\dfrac{0,25.40}{150+250}.100=2,5\%\)