CuO + 2HCl ------> CuCl₂ + H2O
n_{HCl bđ} = 0.5.1.4 = 0.7
n_CuO = \(\dfrac{16}{80}\)= 0.2 mol
=> n_{HCl pư} = 0.4 mol
=> n_{HCl dư} = 0.3 mol

Dung dịch A gồm CuCl₂ và HCl dư
m_CuCl2 = 0.2.135 = 27g
m_{HCl dư} = 0.3.36.5 = 10.95g

CM _CuCl2 = \(\dfrac{0,2}{0,5}\)= 0.4M
CM _{HCl dư} =\(\dfrac{0,3}{0,5}\) = 0.6M

\(a.n_{CuO}=\dfrac{8}{80}=0,1\left(mol\right)\\ CuO+2HCl\rightarrow CuCl_2+H_2O\\ n_{CuCl_2}=n_{CuO}=0,1\left(mol\right)\\ n_{HCl}=2.0,1=0,2\left(mol\right)\\ m_{CuCl_2}=135.0,1=13,5\left(g\right)\\ b.m_{HCl}=0,2.36,5=7,3\left(g\right)\\ c.C_{MddHCl}=\dfrac{0,2}{0,2}=1\left(M\right)\)

Em chưa biết làm dạng này như nào em? Vì dạng này rất cơ bản em ạ!

\(a)n_{HCl}=0,2.1,5=0,3mol\\ CaO+2HCl\rightarrow CaCl_2+H_2O\\ CuO+2HCl\rightarrow CuCl_2+H_2O\\ \Rightarrow\left\{{}\begin{matrix}2n_{CaO}+2n_{CuO}=0,3\\56n_{CaO}+80n_{CuO}=10,8\end{matrix}\right.\\ \Rightarrow n_{CaO}=n_{CaCl_2}=0,05mol;n_{CuO}=n_{CuCl_2}=0,1mol\\ \%m_{CaO}=\dfrac{0,05.56}{10,8}\cdot100=25,93\%\\ \%m_{CuO}=100-25,93=74,07\%\\ b)C_{M_{CaCl_2}}=\dfrac{0,05}{0,2}=0,25M\\ C_{M_{CuCl_2}}=\dfrac{0,1}{0,2}=0,5M\)

\(CaO+2HCl\rightarrow CaCl_2+H_2O\)

x            2x            x           x 

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

y             2y            y          y 

\(\left\{{}\begin{matrix}56x+80y=10,8\\2x+2y=0,2.1,5=0,3\end{matrix}\right.\)

\(\Rightarrow x=0,05;y=0,1\)

\(a,\%m_{CaO}=0,05.56:10,8.100\%=25,93\left(\%\right)\)

\(\%m_{CuO}=100\%-25,93\%=74,07\%\)

\(b,C_{M\left(CaCl_2\right)}=\dfrac{0,05}{0,2}=0,25\left(M\right)\)

\(C_{M\left(CuCl_2\right)}=\dfrac{0,1}{0,2}=0,5\left(M\right)\)

CuO + 2Hcl = CuCl2 + H20

0.075...0,15...0,075

Cm = n/V = 0,15/0,4= 0,375

mCuCl2 = 0,075.135=10,125

a) CuO + 2HCl → CuCl₂ + H₂O

b)0,075.....0,15.......0,075

⇒C_M\(_{HCl}\)=\(\dfrac{1,15}{0,4}\)=0,375M

c)m\(_{CuCl_2}\)=0.075.135=10,125(g)

Mg+2HCl->MgCl2+H2

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

CuO+2HCl->CuCl2+H2O

0,1------0,2

n H2=\(\dfrac{3,36}{22,4}\)=0,15 mol
=>%m Mg=\(\dfrac{0,15.24}{11,6}.100=31,03\%\)

=>m CuO=8g =>n CuO=\(\dfrac{8}{80}\)=0,1 mol

=>%m CuO=68,97%

=>CM HCl=\(\dfrac{0,3+0,2}{0,2}\)=2,5M

Câu 15 : 

\(n_{Al}=\dfrac{10,8}{27}=0,4\left(mol\right)\)

Pt : \(2Al+6HCl\rightarrow2AlCl_3+3H_2\)

     0,4----->1,2------->0,4------>0,6

\(m_{HCl}=1,2.36,5=43,8\left(g\right)\)

\(\Rightarrow m_{ddHCl}=\dfrac{43.8.100\%}{25\%}=175,2\left(g\right)\)

\(m_{ddspu}=10,8+175,2-0,6.2=184,8\left(g\right)\)

\(C\%_{AlCl3}=\dfrac{0,4.133,5}{184,8}.100\%=28,9\%\)

\(n_{CuO}=\dfrac{8}{80}=0.1\left(mol\right)\)

\(CuO+H_2SO_4\rightarrow CuSO_4+H_2O\)

\(0.1...........0.1.........0.1\)

\(n_{NaOH}=0.24\cdot0.5=0.12\left(mol\right)\)

\(2NaOH+H_2SO_4\rightarrow Na_2SO_4+H_2O\)

\(0.12..........0.06\)

\(n_{H_2SO_4}=0.1+0.06=0.16\left(mol\right)\)

\(V_{dd_{H_2SO_4}}=\dfrac{0.16}{1}=0.16\left(l\right)\)

\(C_{M_{H_2SO_4\left(dư\right)}}=\dfrac{0.06}{0.16}=0.375\left(M\right)\)

\(C_{M_{CuSO_4}}=\dfrac{0.1}{0.16}=0.625\left(M\right)\)

\(a) n_{Fe_2O_3}= \dfrac{8}{160} = 0,05(mol)\\ Fe_2O_3 + 6HCl \to 2FeCl_3 + 3H_2O\\ n_{FeCl_3} = 2n_{Fe_2O_3} = 0,1(mol)\\ m_{FeCl_3} = 0,1.162,5 = 16,25(gam)\\ b) n_{HCl} = 6n_{Fe_2O_3} = 0,05.6 = 0,3(mol)\\ V_{dd\ HCl} = \dfrac{0,3}{0,5} = 0,6(lít)\\ c) V_{dd\ sau\ pư} = V_{dd\ HCl} =0,6(lít)\\ C_{M_{FeCl_3}} = \dfrac{0,1}{0,6} = 0,167M\)

PTHH:\(Fe_2O_3+HCl\rightarrow FeCl_3+3H_2O\)

\(n_{Fe_2O_3}=\dfrac{8}{160}=0,05\left(mol\right)\)

a, Bảo toàn nguyên tố Fe:

\(n_{FeCl_3}=n_{Fe}=2n_{Fe_2O_3}=2.0,05=0,1\left(mol\right)\)

\(\Rightarrow m_{FeCl_3}=162,5.0,1=16,25\left(g\right)\)

b, Bảo toàn nguyên tố Cl:

\(n_{Hcl}=n_{Cl}=3n_{FeCl_3}=3.0,1=0,3\left(mol\right)\)

\(\Rightarrow V_{ddHCl}=\dfrac{n_{HCL}}{C_M}=\dfrac{0,3}{0,5}=0,6\left(l\right)\)

c,\(C_{M_{FeCl_3}}=\dfrac{n_{FeCl_3}}{V_{ddFeCl_3}}=\dfrac{0,1}{0,6}=0,17M\)

Cho em hỏi M là j ạ

PTHH: \(Fe_2O_3+HCl\rightarrow FeCl_3+3H_2O\)

\(n_{Fe_2O_3}=\dfrac{8}{160}=0,05\left(mol\right)\)

a, Bảo toàn nguyên tố Fe:

\(n_{FeCl_3}=n_{Fe}=2n_{Fe_2O_3}=2.0,05=0,1\left(mol\right)\)

\(\Rightarrow m_{FeCl_3}=162,5.0,1=16,25\left(g\right)\)

b, Bảo toàn nguyên tố Cl:

\(n_{HCl}=n_{Cl}=3n_{FeCl_3}=3.0,1=0,3\left(mol\right)\)

\(\Rightarrow V_{ddHCl}=\dfrac{n_{HCl}}{C_M}=\dfrac{0,3}{0,5}=0,6\left(l\right)\)

c, \(C_{M_{FeCl_3}}=\dfrac{n_{FeCl_3}}{V_{ddFeCl_3}}=\dfrac{0,1}{0,6}=0,17M\)

Mk gửi bạn nhé

Đáp án:

 a. 16,25g

 b. 0,6l

 c. 0,05M

Giải thích các bước giải:

Fe₂O₃+6HCl → 2FeCl₃ + 3H₂O

  0,05      0,3        0,1       

nFe2O3= 8/160= 0,05 mol

a. mFeCl3= 0,1. 162,5= 16,25g

b. VHCl= 0,3/0,5 = 0,6l

c. CMFeCl3 = 0,1/0,5= 0,05M