\(a,n_{Na_2SO_4}=0,2\cdot0,2=0,04\left(mol\right);n_{Ba\left(OH\right)_2}=0,2\cdot0,1=0,02\left(mol\right)\\ PTHH:Na_2SO_4+Ba\left(OH\right)_2\rightarrow2NaOH+BaSO_4\downarrow\\ TL:....1.....1......2......1\left(mol\right)\\ BR:.......0,02.....0,02......0,04......0,02\left(mol\right)\)

Vì \(\dfrac{n_{Na_2SO_4}}{1}>\dfrac{n_{Ba\left(OH\right)_2}}{1}\) nên \(Na_2SO_4\) dư, \(Ba\left(OH\right)_2\) hết

\(b,C_{M_{NaOH}}=\dfrac{0,04}{0,2+0,2}=0,1M\)

a) $CuSO_4 + 2NaOH \to Cu(OH)_2 + Na_2SO_4$
b) Theo PTHH : $n_{Cu(OH)_2} = n_{CuSO_4} = \dfrac{64}{160} = 0,4(mol)$

$m_{Cu(OH)_2} = 0,4.98 = 39,2(gam)$

c) $n_{NaOH} = 2n_{CuSO_4} = 0,8(mol)$
$C_{M_{NaOH}} = \dfrac{0,8}{0,4} = 2M$

nCO2=0,075 mol

CO2 + 2KOH => K2CO3 + H2O
0,075 mol       =>0,075 mol
CM dd K2CO3=0,075/0,25=0,3M

\(a/ CO_2+2NaOH \to Na_2CO_3+H_2O\\ n_{CO_2}=0,1(mol)\\ b/\\ n_{NaOH}=0,1.2=0,2(mol)\\ CM_{NaOH}=\frac{0,2}{0,2}=1M\\ c/\\ n_{Na_2CO_3}=n_{CO_2}=0,1(mol)\\ m_{Na_2CO_3}=0,1.106==10,6(g)$\)

:)))))

\(a,Zn+H_2SO_4\rightarrow ZnSO_4+H_2\\ b,n_{H_2}=\dfrac{7,437}{24,79}=0,3mol\\ n_{Zn}=n_{H_2SO_4}=n_{ZnSO_4}=n_{H_2}=0,3mol\\ m_{Zn}=0,3.65=19,5g\\ c,C_{M_{H_2SO_4}}=\dfrac{0,3}{0,05}=6M\\ d,m_{ZnCl_2}=0,3.136=40,8g\)

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

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

\(\Rightarrow\left\{{}\begin{matrix}n_{HCl}=0,2\left(mol\right)\\\%m_{Fe}=\dfrac{0,1\cdot56}{12}\cdot100\%\approx46,67\%\end{matrix}\right.\) \(\Rightarrow\left\{{}\begin{matrix}C_{M_{HCl}}=\dfrac{0,2}{0,2}=1\left(M\right)\\\%m_{Cu}=53,33\%\end{matrix}\right.\)

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

Cu không phản ứng

\(nH_2=nFe=\dfrac{2,24}{22,4}=0,1mol\)

\(\rightarrow mFe=0,1.56=5,6gam\)

\(\rightarrow\%mFe=\dfrac{5,6}{12}.100\%=46,\left(6\right)\%\)

\(\rightarrow\%mCu=100\%-46,\left(6\right)\%=53,\left(3\right)\%\)

c)

\(CM_{HCl}=\dfrac{0,1.2}{0,2}=1M\)