\(a,CO_2+Ba(OH)_2\to BaCO_3\downarrow+H_2O\\ b,n_{CO_2}=\dfrac{2,24}{22,4}=0,1(mol)\\ \Rightarrow n_{Ba(OH)_2}=0,1(mol)\\ \Rightarrow C_{M_{Ba(OH)_2}}=\dfrac{0,1}{0,2}=0,5M\\ c,n_{BaCO_3}=0,1(mol)\\ \Rightarrow m_{BaCO_3}=0,1.197=19,7(g)\)

n_CO2 = 0.1 (mol) 

Ba(OH)2 + CO2 => BaCO3 + H2O 

0.1________0.1_____0.1

CM Ba(OH)2 = 0.1/0.2 = 0.5 M 

mBaCO3 = 0.1*197 = 19.7 (g) 

Chúc học tốt <3 

Giúp mình vớiii

1

a)C%=\(\dfrac{20}{620}100=3,225\%\)

b) CM=\(\dfrac{1,5}{0,75}=2M\)

2

3H2+Fe2O3-to>2Fe+3H2O

            0,1----------0,2

n Fe=0,2 mol

=>m Fe2O3=0,1.160=16g

a, Gọi \(\left\{{}\begin{matrix}n_{Fe}=a\left(mol\right)\\n_{Al}=b\left(mol\right)\end{matrix}\right.\)

\(n_{H_2}=\dfrac{11,2}{22,4}=0,5\left(mol\right)\)

PTHH:

Fe + 2HCl ---> FeCl₂ + H₂

a--->2a------------------>a

2Al + 6HCl ---> 2AlCl₃ + 3H₂

b---->3b-------------------->1,5b

=> \(\left\{{}\begin{matrix}56a+27b=16,6\\a+1,5b=0,5\end{matrix}\right.\Leftrightarrow a=b=0,2\left(mol\right)\)

=> \(\left\{{}\begin{matrix}m_{Fe}=0,2.56=11,2\left(g\right)\\m_{Al}=0,2.27=5,4\left(g\right)\end{matrix}\right.\)

b) \(C\%_{HCl}=\dfrac{\left(0,2.2+0,2.3\right).36,5}{300}.100\%=12,167\%\)

\(n_{H_2}=\dfrac{11,2}{22,4}=0,5\left(mol\right)\) 
gọi nFe : a , nAl: b (a,b>0)  => 56a + 27b = 16,6 (g) 
\(pthh:Fe+2HCl\rightarrow FeCl_2+H_2\uparrow\) 
           a                                     a
         \(2Al+6HCl\rightarrow2AlCl_3+3H_2\uparrow\) 
           b                                     \(\dfrac{3b}{2}\)
          
=> \(a+\dfrac{3b}{2}=0,5\) 
ta có hệ pt 
\(\left\{{}\begin{matrix}56a+27b=16,6\\a+\dfrac{3b}{2}=0,5\end{matrix}\right.\) 
=> a= 0,2 , b = 0,2 
\(\left\{{}\begin{matrix}m_{Fe}=0,2.56=11,2\left(g\right)\\m_{Al}=16,6-11,2=5,4\left(g\right)\end{matrix}\right.\) 
\(pthh:Fe+2HCl\rightarrow FeCl_2+H_2\) 
           0,2     0,4 
        \(2Al+6HCl\rightarrow2AlCl_3+3H_2\) 
           0,2    0,6 
=> \(m_{HCl}=\left(0,4+0,6\right).36,5=36,5\left(g\right)\) 
=> \(C\%=\dfrac{36,5}{200}.100\%=18,25\%\)

Bài 13 : 

\(a)n_{Fe_2O_3} = \dfrac{9,6}{160} = 0,06(mol)\\ Fe_2O_3 + 6HCl \to 2FeCl_3 + 3H_2O\\ n_{HCl} = 6n_{Fe_2O_3} = 0,36(mol)\\ C\%_{HCl} = \dfrac{0,36.36,5}{150}.100\% = 8,76\%\\ \Rightarrow X = 8,76 b) n_{FeCl_3} = 2n_{Fe_2O_3} = 0,12(mol)\\ m_{FeCl_3} = 0,12.162,5 =19,5(gam)\)

Bài 11 : 

\(a) n_{NaOH} = 0,2.1,5 = 0,3(mol)\\ 2NaOH + H_2SO_4 \to Na_2SO_4 + 2H_2O\\ n_{H_2SO_4} = \dfrac{1}{2}n_{NaOH} = 0,15(mol)\\ \Rightarrow x = \dfrac{0,15}{0,12}= 1,25(M)\\ b) n_{Na_2SO_4} = n_{H_2SO_4} = 0,15(mol)\\ m_{Na_2SO_4} = 0,15.142 = 21,3(gam)\)

Bài 9 : 

\(a) n_{Fe_2O_3} = \dfrac{3,2}{160}=0,02(mol)\\ Fe_2O_3 + 3H_2SO_4 \to Fe_2(SO_4)_3 + 3H_2O\\ n_{H_2SO_4} = 3n_{Fe_2O_3} = 0,06(mol)\\ m_{dd\ H_2SO_4} = \dfrac{0,06.98}{19,6\%} = 30(gam)\\ b) \text{Chất tan : } Fe_2(SO_4)_3\\ n_{Fe_2(SO_4)_3} = n_{Fe_2O_3} = 0,02(mol)\\ m_{Fe_2(SO_4)_3} = 0,02.400 =8(gam)\)

Bài 8 : 

\(n_{Al_2O_3} = \dfrac{2,04}{102} = 0,02(mol)\\ Al_2O_3 + 6HCl \to 2AlCl_3 + 3H_2O\\ n_{HCl} = 6n_{Al_2O_3} = 0,02.6 = 0,12(mol)\\ C_{M_{HCl}} = \dfrac{0,12}{0,2} =0,6M\)

\(a,Fe+H_2SO_4\rightarrow FeSO_4+H_2\\ Fe_2O_3+3H_2SO_4\rightarrow Fe_2\left(SO_4\right)_3+3H_2O\\ n_{H_2}=\dfrac{4,48}{22,4}=0,2\left(mol\right)\\ b,n_{Fe}=n_{H_2}=0,2\left(mol\right)\\ \%m_{Fe}=\dfrac{0,2.56}{12,8}.100\%=87,5\%\\ \%m_{Fe_2O_3}=100\%-87,5\%=12,5\%\\ c,n_{Fe_2O_3}=\dfrac{12,8-11,2}{160}=0,01\left(mol\right)\\ n_{H_2SO_4}=n_{Fe}+3n_{Fe_2O_3}=0,2+3.0,01=0,23\left(mol\right)\\ V_{ddH_2SO_4}=\dfrac{0,23}{0,46}=0,5\left(M\right)\)