nC2H4Br2 = \(\dfrac{4,7}{188}\)=0,025(mol)

C2H4 + Br2 -> C2H4Br2

0,025 <-----------0,025

=>VC2H4 = 0,025 . 22,4=0,56(l)

=> VCH4 = 2,8 - 0,56 =2,24 (l)

%VCH4 =\(\dfrac{2,24.100}{2,8}\)=80%

%VC2H4 = 100 % -80% = 20%

Bài 9 : 

Metan không tác dụng với dung dịch 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) \(n_{C2H4}=\dfrac{0,025.1}{1}=0,025\left(mol\right)\)

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

\(\%V_{C2H4}=\dfrac{0,56.100}{2,8}=20\%\)

\(\%V_{CH4}=100\%-20\%=80\%\)

 Chúc bạn học tốt

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

Ta có: \(n_{C_2H_4Br_2}=\dfrac{28,2}{188}=0,15\left(mol\right)\)

Theo PT: \(n_{C_2H_4}=n_{Br_2}=n_{C_2H_4Br_2}=0,15\left(mol\right)\)

\(\Rightarrow\left\{{}\begin{matrix}\%V_{C_2H_4}=\dfrac{0,15.22,4}{5,6}.100\%=60\%\\\%V_{CH_4}=40\%\end{matrix}\right.\)

\(m_{Br_2}=0,15.160=24\left(g\right)\)

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

Ta có:

nhh = 0,125(mol)

=> nC2H4Br2 = 4,7/188 = 0,025(mol)

C2H4 + Br2 => C2H4Br2

0,025_______0,025__________

=> nCH4 = 0,125-0,025 = 0,1(mol)

=> %VCH4 = 0,1.100/0,125 = 80%

a) \(n_{C_2H_4Br_2}=\dfrac{4,7}{188}=0,025\left(mol\right)\)

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

           0,025<------------0,025

b) \(\left\{{}\begin{matrix}V_{C_2H_4}=0,025.22,4=0,56\left(l\right)\\V_{CH_4}=5,6-0,56=5,04\left(l\right)\end{matrix}\right.\)

\(n_{Br_2}=\dfrac{m_{Br_2}}{M_{Br_2}}=\dfrac{16}{160}=0,1mol\)

\(C_2H_4+Br_2\rightarrow C_2H_4Br_2\)

0,1         0,1                        ( mol )

\(\%V_{C_2H_4}=\dfrac{0,1.22,4}{16,8}.100=13,33\%\)

\(\%V_{CH_4}=100\%-13,33\%=86,67\%\)

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

Hiện tượng: Dung dịch Brom bị nhạt màu

b) Ta có: \(n_{Br_2}=\dfrac{24}{160}=0,15\left(mol\right)=n_{C_2H_4Br_2}\)

\(\Rightarrow m_{C_2H_4Br_2}=0,15\cdot188=28,2\left(g\right)\)

c) Theo PTHH: \(n_{C_2H_4}=0,15\left(mol\right)\)

\(\Rightarrow\%V_{C_2H_4}=\dfrac{0,15\cdot22,4}{4,48}\cdot100\%=75\%\)

\(\Rightarrow\%V_{CH_4}=25\%\)

a) C₂H₄ + Br₂ --> C₂H₄Br₂

b) n_Br2 = 2.0,15 = 0,3 (mol)

PTHH: C₂H₄ + Br₂ --> C₂H₄Br₂

             0,3<--  0,3----->0,3

=> \(m_{C_2H_4Br_2}=0,3.188=56,4\left(g\right)\)

c) \(\%V_{C_2H_4}=\dfrac{0,3.22,4}{22,4}.100\%=30\%\)

\(\%V_{CH_4}=100\%-30\%=70\%\)