a) \(C_2H_4 + Br_2 \to C_2H_4Br_2\)

b)

\(n_{C_2H_4} = n_{Br_2} = \dfrac{5,6}{160} = 0,035(mol)\\ \%V_{C_2H_4} = \dfrac{0,035.22,4}{0,86}.100\% = 91,16\%\\ \%V_{CH_4} = 100\% - 91,16\% = 8,84\%\)

a, PT: \(C_2H_2+2Br_2\rightarrow C_2H_2Br_4\)

b, \(n_{Br_2}=\dfrac{5,6}{160}=0,035\left(mol\right)\)

Theo PT: \(n_{C_2H_2}=\dfrac{1}{2}n_{Br_2}=0,0175\left(mol\right)\)

\(\Rightarrow\%V_{C_2H_2}=\dfrac{0,0175.22,4}{0,86}.100\%\approx45,58\%\)

\(\Rightarrow\%V_{CH_4}\approx54,42\%\)

\(m_{Br_2}=80g\Rightarrow n_{Br_2}=0,5mol\)

\(C_2H_4+Br_2\rightarrow C_2H_4Br_2\)

0,5         0,5

\(n_{hh}=\dfrac{28}{22,4}=1,25mol\)

\(\Rightarrow n_{CH_4}=1,25-0,5=0,75mol\)

\(\%V_{CH_4}=\dfrac{0,75}{1,25}\cdot100\%=60\%\)

\(\%V_{C_2H_4}=100\%-60\%=40\%\)

a) 

C₂H₄ + Br₂ --> C₂H₄Br₂

C₂H₂ + 2Br₂ --> C₂H₂Br₄

b) Gọi số mol C₂H₄, C₂H₂ là a, b (mol)

=> \(a+b=\dfrac{11,2}{22,4}=0,5\) (1)

PTHH: C₂H₄ + Br₂ --> C₂H₄Br₂

                a---->a

             C₂H₂ + 2Br₂ --> C₂H₂Br₄

                b---->2b

=> a + 2b = \(\dfrac{112}{160}=0,7\) (2)

(1)(2) => a = 0,3 (mol); b = 0,2 (mol)

\(\left\{{}\begin{matrix}\%V_{C_2H_4}=\dfrac{0,3}{0,5}.100\%=60\%\\\%V_{C_2H_2}=\dfrac{0,2}{0,5}.100\%=40\%\end{matrix}\right.\)

\(\left\{{}\begin{matrix}\%m_{C_2H_4}=\dfrac{0,3.28}{0,3.28+0,2.26}.100\%=61,765\%\\\%m_{C_2H_2}=\dfrac{0,2.26}{0,3.28+0,2.26}.100\%=38,235\%\end{matrix}\right.\)

a, PT: \(C_2H_4+Br_2\rightarrow C_2H_4Br_2\)

b, - Khí thoát ra là CH₄.

⇒ V_CH4 = 4,48 (l)

\(\Rightarrow\left\{{}\begin{matrix}\%V_{CH_4}=\dfrac{4,48}{11,2}.100\%=40\%\\\%V_{C_2H_4}=100-40=60\%\end{matrix}\right.\)

C2H4 + Br2 -> C2H4Br2

  a          a            a

C2H2 + 2Br2 -> C2H2Br4

   b          2b             b

n hỗn hợp khí = \(\dfrac{7.84}{22.4}=0.35mol\)

Ta có: \(\left\{{}\begin{matrix}a+b=0.35\\160a+320b=72\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}a=0.25mol\\b=0.1mol\end{matrix}\right.\)

\(\%VC2H4=\dfrac{0.25\times22.4\times100}{7.84}=71.43\%\)

%VC2H2 = 100 - 71.43 = 28.57%

C2H4 + Br2 -> C2H4Br2

  a          a            a

C2H2 + 2Br2 -> C2H2Br4

   b          2b             b

n hỗn hợp khí = %VC2H4=0.25×22.4×1007.84=71.43%%VC2H4=0.25×22.4×1007.84=71.43%

%VC2H2 = 100 - 71.43 = 28.57%

 Gọi số mol của C2H4 và C2H2 lần lượt là x và y mol
theo bài ra: x+y = 0,56/22,4 = 0,025 (mol) 
Pt:
C2H4 + Br2 → C2H4Br2
x mol x mol x mol
C2H2 + 2 Br2 → C2H2Br4
y mol 2y mol y mol
Số mol n Br2 = x+2y = 5,6/160 = 0,035 9mol) 
Giải hệ ta đc: x = 0,015 và y = 0,01
=> %V C2H4 = 0,015/0,025 = 60% ; %V C2H2 = 40%

Bài 14 : 

Vì metan không tác dụng với Brom nên : 

\(n_{C2H4Br2}=\dfrac{4,7}{188}=0,025\left(mol\right)\)

a) Pt : \(C_2H_4+Br_2\rightarrow C_2H_4Br_{2|}\)

              1          1                1

            0,025                    0,025

b) \(n_{C2H4}=\dfrac{0,025.1}{1}=0,025\left(mol\right)\)

\(V_{C2H4\left(dktc\right)}=0,025.22,4=0,56\left(l\right)\)

\(V_{CH4\left(dktc\right)}=1,4-0,56=0,84\left(l\right)\)

⁰/₀V_CH4 = \(\dfrac{0,84.100}{1,4}=60\)⁰/₀

⁰/₀V_C2H4 = \(\dfrac{0,56.100}{1,4}=40\)⁰/₀

 Chúc bạn học tốt

\(n_{Br_2}=\dfrac{4}{160}=0,025\left(mol\right);n_{hh}=\dfrac{2,8}{22,4}=0,125\left(mol\right)\)

PTHH: \(C_2H_4+Br_2\rightarrow C_2H_4Br_2\)

            0,025<-0,125

\(\Rightarrow\left\{{}\begin{matrix}\%V_{C_2H_4}=\dfrac{0,025}{0,125}.100\%=20\%\\\%V_{CH_4}=100\%-20\%=80\%\end{matrix}\right.\)