Gọi số mol Na2SO4 Na2SO3 NaHSO3 lần lượt là a, b ,c

\(\text{142a+126b+104c=10}\)

*Tác dụng HCl

nkhí=nSO2=0.045

\(=\text{>b+c=0.045}\)

*Tác dụng NaOH

\(\text{NaHSO3+NaOh-->Na2SO3+H2O}\)

\(\text{nNaOH=0.5*0.015*10/2.5=0.03}\)

=>c=0.03

Vậy:

a=0.0351

b=0.015

c=0.03

\(\left\{{}\begin{matrix}\text{%mNa2SO4=0.03513*142/10=49.89%}\\\text{%mNA2SO3=0.015*126/10=18.9%}\\\text{%mNaHSo3=31.21%}\end{matrix}\right.\)

a) Khí A : Cacbon đioxit

b) $CaCO_3 + 2HCl \to CaCl_2 + CO_2 + H_2O$

$n_{CO_2} = \dfrac{448}{1000.22,4} = 0,02(mol)$

Theo PTHH : $n_{HCl} = 2n_{CO_2} = 0,04(mol)$
$C_{M_{HCl}} = \dfrac{0,04}{0,2} = 0,2M$

c) $n_{CaCO_3} = n_{CO_2} = 0,02(mol)$
$\%m_{CaCO_3} = \dfrac{0,02.100}{5}.100\% = 40\%$

$\%m_{CaSO_4} = 100\% - 40\% = 60\%$

Bài 1:

Ta có: \(n_{H_2}=\dfrac{0,4}{2}=0,2\left(mol\right)\)

Bảo toàn Hidro: \(n_{HCl}=2n_{H_2}=0,4\left(mol\right)\) \(\Rightarrow m_{HCl\left(p.ứ\right)}=0,4\cdot36,5=14,6\left(g\right)\)

Bảo toàn khối lượng: \(m_{muối}=m_{KL}+m_{HCl\left(p.ứ\right)}-m_{H_2}=24,7\left(g\right)\)

Bài 2:

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

Ta có: \(n_{H_2}=\dfrac{2,24}{22,4}=0,1\left(mol\right)=n_{Fe}\)

\(\Rightarrow\%m_{Fe}=\dfrac{0,1\cdot56}{12,8}\cdot100\%=43,75\%\) \(\Rightarrow\%m_{FeO}=56,25\%\)

Bài 3:

PTHH: \(KOH+HCl\rightarrow KCl+H_2O\)

Ta có: \(n_{KOH}=0,1\cdot1=0,1\left(mol\right)=n_{HCl}\)

*Bạn bổ sung thêm thể tích ddHCl thêm nhé !! 

\(n_{H_2}=\dfrac{4,48}{22,4}=0,2\left(mol\right)\)

PTHH: Zn + 2HCl ---> ZnCl₂ + H₂

           0,2<--0,4<------0,2<-----0,2

=> \(\left\{{}\begin{matrix}\%m_{Zn}=\dfrac{0,2.65}{21,1}.100\%=61,61\%\\\%m_{ZnO}=100\%-61,61\%=38,39\%\end{matrix}\right.\)

\(n_{ZnO}=\dfrac{21,1-0,2.65}{81}=0,1\left(mol\right)\)

PTHH: ZnO + 2HCl ---> ZnCl₂ + H₂O

            0,1---->0,2------>0,1

=> \(C\%_{HCl}=\dfrac{\left(0,2+0,4\right).36,5}{200}.100\%=10,95\%\)

\(m_{mu\text{ố}i}=m_{ZnCl_2}=\left(0,1+0,2\right).136=40,8\left(g\right)\)

\(a.n_{CO_2}=\dfrac{0,00448}{22,4}=0,0002mol\\ Na_2CO_3+2HCl\rightarrow2NaCl+CO_2+H_2O\\ n_{HCl}=n_{NaCl}=0,0002.2=0,0004mol\\ C_{M_{HCl}}=\dfrac{0,0004}{0,04}=0,01M\\ b.n_{Na_2CO_3}=n_{CO_2}=0,0002mol\\ m_{NaCl}=0,0004.58,5+\left(10-0,0002.106\right)=10,022g\\ c,\%m_{Na_2CO_3}=\dfrac{0,0002.106}{10}\cdot100=0,212\%\\ \%m_{NaCl}=100-0,212=99,788\%\)

\(a.CaCO_3+2HCl\rightarrow CaCl_2+CO_2+H_2O\\ n_{CaCO_3}=n_{CO_2}=\dfrac{448:1000}{22,4}=0,02\left(mol\right)\\ n_{HCl}=0,02.2=0,04\left(mol\right)\\ C\%_{ddHCl}=\dfrac{0,04.36,5}{1,18.200}\approx0,619\%\\b.m_{CaCO_3}=0,02.100=2\left(g\right)\\ \%m_{CaCO_3}=\dfrac{2}{5}.100=40\%\\ \%m_{CaSO_4}=100\%-40\%=60\% \)

Mình tra KLR của dd HCl trên mạng là 1,18g/ml nên áp dụng vào bài nha ^^

a, \(CH_3COOH+Na\rightarrow CH_3COONa+\dfrac{1}{2}H_2\)

\(C_2H_5OH+Na\rightarrow C_2H_5ONa+\dfrac{1}{2}H_2\)

\(CH_3COOH+NaOH\rightarrow CH_3COONa+H_2O\)

b, Ta có: \(n_{NaOH}=0,2.0,5=0,1\left(mol\right)\)

Theo PT: \(n_{CH_3COOH}=n_{NaOH}=0,1\left(mol\right)\)

\(n_{H_2}=\dfrac{6,72}{22,4}=0,3\left(mol\right)\)

Theo PT: \(n_{H_2}=\dfrac{1}{2}n_{CH_3COOH}+\dfrac{1}{2}n_{C_2H_5OH}=0,3\)

\(\Rightarrow n_{C_2H_5OH}=0,5\left(mol\right)\)

\(\Rightarrow m=m_{CH_3COOH}+m_{C_2H_5OH}=0,1.60+0,5.46=29\left(g\right)\)

\(\Rightarrow\left\{{}\begin{matrix}\%m_{CH_3COOH}=\dfrac{0,1.60}{29}.100\%\approx20,69\%\\\%m_{C_2H_5OH}\approx79,31\%\end{matrix}\right.\)