$n_{CaO} = \dfrac{11,2}{56} = 0,2(mol)$
$n_{HCl} = 0,5.1 = 0,5(mol)$

$CaO +  dư2HCl \to CaCl_2 + H_2O$

Ta thấy :

$n_{CaO} : 1 < n_{HCl} : 2$ nên $HCl$ dư

$n_{HCl\ pư} = 2n_{CaO} = 0,4(mol)$
$m_{HCl\ dư} = (0,5 - 0,4).36,5 = 3,65(gam)$

$n_{CaCl_2} = n_{CaO} = 0,2(mol)$
$C_{M_{HCl\ dư}} = \dfrac{0,1}{0,5} = 0,2M$
$C_{M_{CaCl_2}} = \dfrac{0,2}{0,5} = 0,4M$

\(n_{CaO}=\dfrac{11,2}{56}=0,2\left(mol\right)\\ n_{HCl}=0,5.1=0,5\left(mol\right)\\ CaO+2HCl\xrightarrow[]{}CaCl_2+H_2O\\ \Rightarrow\dfrac{0,2}{1}< \dfrac{0,5}{2}\Rightarrow HCl.dư\\ n_{HCl\left(pư\right)}=0,2.2=0,4\left(mol\right)\\ n_{HCl\left(dư\right)}=0,5-0,4=0,1\left(mol\right)\\ m_{HCl\left(dư\right)}=0,1.36,5=3,65\left(g\right)\\ n_{CaCl_2}=n_{CaO}=0,2mol\\ C_{M_{CaCl_2}}=\dfrac{0,2}{0,5}=0,4\left(M\right)\\ C_{M_{HCl}}=\dfrac{0,1}{0,5}=0,2\left(M\right)\)

Làm ở điều kiện tiêu chuẩn nhé

Giải:

\(n_{SO_2}=\dfrac{56}{1000}:22,4=0,0025\left(mol\right)\)

\(n_{Ca\left(OH\right)_2}=0,3.0,01=0,003\left(mol\right)\)

\(SO_2+Ca\left(OH\right)_2\rightarrow CaSO_3+H_2O\)

0,0025 --------------> 0,0025

Xét \(\dfrac{0,0025}{1}< \dfrac{0,003}{1}\) => \(Ca\left(OH\right)_2\) dư

\(m_{kt}=m_{CaSO_3}=0,0025.120=0,3\left(g\right)\)

\(n_{SO_2}=\dfrac{0,056}{22,4}=0,0025\left(mol\right)\\ n_{Ca\left(OH\right)_2}=0,3.0,01=0,003\left(mol\right)\\ SO_2+Ca\left(OH\right)_2\xrightarrow[]{}CaSO_3+H_2O\\ \Rightarrow\dfrac{0,0025}{1}< \dfrac{0,003}{1}\Rightarrow Ca\left(OH\right)_2.dư\\ n_{CaSO_3}=n_{Ca\left(OH\right)_2}=n_{SO_2}=0,0025mol\\ m_{CaSO_3}=0,0025.120=0,3\left(g\right)\)

\(CaCO_3\rightarrow\left(t^o\right)CaO+CO_2\\ CO_2+Ba\left(OH\right)_2\rightarrow BaCO_3+H_2O\\ m_{BaCO_3}=17,73\left(g\right)\Rightarrow n_{BaCO_3}=0,09\left(mol\right)\\ n_{Ba\left(OH\right)_2}=n_{BaCO_3}=0,09\left(mol\right)\\ V=V_{ddBa\left(OH\right)_2}=\dfrac{0,09}{2}=0,045\left(l\right)\)

\(n_{CO_2}=0,3\left(mol\right)\\ n_{OH^-}=1,5.0,1+0,1.2=0,35\left(mol\right)\\ 2>T=\dfrac{n_{OH^-}}{n_{CO_2}}=\dfrac{0,35}{0,3}=\dfrac{7}{6}>1\\ PTHH:CO_2+2OH^-\rightarrow CO^{2-}_3+H_2O\left(1\right)\\CO_2+OH^-\rightarrow HCO^-_3\left(2\right)\\ Đặt:n_{CO_2\left(1\right)}=a\left(mol\right);n_{CO_2\left(2\right)}=b\left(mol\right)\left(a,b>0\right)\\ \Rightarrow\left\{{}\begin{matrix}a+b=0,3\\2a+b=0,35\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}a=0,05\\b=0,25\end{matrix}\right.\\ \Rightarrow Tạo:CO^{2-}_3,HCO^-_3\\ Ca^{2+}+CO^{2-}_3\rightarrow CaCO_3\downarrow\\ n_{CaCO_3}=n_{CO^{2-}_3}=a=0,05\left(mol\right)\\ m=m_{CaCO_3}=0,05.100=5\left(g\right)\)

\(n_{H^+}=2.0,4.0,05=0,04mol\\ n_{OH^-}=2.0,1.0,175=0,035mol\\ pH=-log\left[H^+\right]=-log\left(\dfrac{0,04-0,035}{0,4+0,1}\right)=2\)

\(n_{CuO}=\dfrac{12}{80}=0,15\left(mol\right)\)

\(n_{HCl}=0,4.1=0,4\left(mol\right)\)

\(CuO+2HCl\rightarrow CuCl_2+H_2O\)

0,15 ---> 0,3 -----> 0,15 ----> 0,15

Xét: \(\dfrac{0,15}{1}< \dfrac{0,4}{2}\) => axit dư

a. HCl dư sau phản ứng và \(n_{HCl.dư}=0,4-0,3=0,1\left(mol\right)\)

b.

Trong dung dịch A có:

\(m_{HCl}=0,1.36,5=3,65\left(g\right)\)

\(m_{CuCl_2}=0,15.135=20,25\left(g\right)\\ m_{H_2O}=0,15.18=2,7\left(g\right)\)

HCl mấy M v bạn ?

\(n_{FeO}=\dfrac{10,8}{72}=0,15\left(mol\right)\)

\(n_{H_2SO_4}=\dfrac{100.20\%}{100\%}:98=\dfrac{10}{49}\left(mol\right)\)

\(FeO+H_2SO_4\rightarrow FeSO_4+H_2O\)

0,15----> 0,15 -----> 0,15----->0,15

Xét \(\dfrac{10}{49}:1>\dfrac{0,15}{1}\) => axit dư.

Sau khi phản ứng kết thúc, trong dung dịch có:

\(m_{H_2SO_4}=\left(\dfrac{10}{49}-0,15\right).98=5,3\left(g\right)\)

\(m_{FeSO_4}=0,15.152=22,8\left(g\right)\)

\(m_{H_2O}=0,15.18=2,7\left(g\right)\)

đọc kỹ đề nhé ctv: từng chất trong dung dịch

\(n_{CuO}=\dfrac{12}{80}=0,15\left(mol\right)\)

\(n_{HCl}=2.0,2=0,4\left(mol\right)\)

PTHH :

                 \(CuO+2HCl\rightarrow CuCl_2+H_2\uparrow\)

trc p/ư:      0,15      0,4 

p/ư :          0,15      0,3       0,15          0,15 

sau p/ư :   0        0,1         0,15        0,15 

--> sau p/ư : HCl dư 

\(a,m_{CuCl_2}=0,15.135=20,25\left(g\right)\)

\(b,C_{M\left(CuCl_2\right)}=\dfrac{0,15}{0,2}=0,75\left(M\right)\)

\(a)n_{CuO}=\dfrac{12}{80}=0,15\left(mol\right)\\ n_{HCl}=0,2.2=0,4\left(mol\right)\\ CuO+2HCl\xrightarrow[]{}CuCl_2+H_2\\ \dfrac{0,15}{1}< \dfrac{0,4}{2}\Rightarrow HCl.dư\\ n_{CuCl_2}=n_{CuO}=n_{H_2}=0,15mol\\ m_{CuCl_2}=0,15.135=20,25\left(g\right)\\ b)C_{MCuCl_2}=\dfrac{0,15}{0,2}=0,75\left(M\right)\\ n_{HCl\left(pư\right)}=0,15.2=0,3\left(mol\right)\\ n_{HCl\left(dư\right)}=0,4-0,3=0,1\left(mol\right)\\ C_{MHCl\left(dư\right)}=\dfrac{0,1}{0,2}=0,5\left(M\right)\)