\(n_{Br_2}=\dfrac{4}{160}=0,025mol\)

\(C_2H_4+Br_2\rightarrow C_2H_4Br_2\)

0,025     0,025                     ( mol )

\(V_{hh}=\dfrac{2,8}{22,4}=0,125mol\)

\(\%V_{C_2H_4}=\dfrac{0,025}{0,125}.100=20\%\)

\(\%V_{CH_4}=100\%-20\%=80\%\)

a) \(n_{C_2H_4Br_2}=\dfrac{18,8}{188}=0,1\left(mol\right)\)

PTHH: C₂H₄ + Br₂ --> C₂H₄Br₂

            0,1<----0,1<---0,1

=> \(m_{Br_2}=0,1.160=16\left(g\right)\)

b)

\(\%V_{C_2H_4}=\dfrac{0,1.22,4}{4}.100\%=56\%\)

=> \(\%V_{CH_4}=100\%-56\%=44\%\)

c) \(n_{CH_4}=\dfrac{4.44\%}{22,4}=\dfrac{11}{140}\left(mol\right)\)

PTHH: CH₄ + 2O₂ --t^o--> CO₂ + 2H₂O

          \(\dfrac{11}{140}\)-->\(\dfrac{11}{70}\)

            C₂H₄ + 3O₂ --t^o--> 2CO₂ + 2H₂O

           0,1---->0,3

=> \(V_{O_2}=\left(\dfrac{11}{70}+0,3\right).22,4=10,24\left(l\right)\)

=> V_kk = 10,24.5 = 51,2 (l)

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

a, - Khí pư với Brom là C₂H₄

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

b, Ta có: \(n_{Br_2}=\dfrac{16}{160}=0,1\left(mol\right)\)

Theo PT: \(n_{C_2H_4}=n_{Br_2}=0,1\left(mol\right)\)

\(\Rightarrow\left\{{}\begin{matrix}\%m_{C_2H_4}=\dfrac{0,1.28}{4}.100\%=70\%\\\%m_{CH_4}=100-70=30\%\end{matrix}\right.\)

\(n_{hh}=\dfrac{2,8}{22,4}=0,125mol\)

\(\left\{{}\begin{matrix}n_{etilen}=x\left(mol\right)\\n_{metan}=y\left(mol\right)\end{matrix}\right.\)

\(m_{Br_2}=4g\Rightarrow n_{Br_2}=0,025mol\)

\(C_2H_4+Br_2\rightarrow C_2H_4Br_2\)

0,025    0,025     0,025

a)\(m_{C_2H_4Br_2}=0,025\cdot188=4,7g\)

b)\(n_{CH_4}=0,125-0,025=0,1mol\)

\(\%m_{CH_4}=\dfrac{0,1\cdot16}{0,1\cdot16+0,025\cdot28}\cdot100\%=69,57\%\)

\(\%m_{C_2H_2}=100\%-69,57\%=30,43\%\)

\(\%V_{CH_4}=\dfrac{0,1}{0,125}\cdot100\%=80\%\)

\(\%V_{C_2H_4}=100\%-80\%=20\%\)

c)\(C_2H_4+2O_2\underrightarrow{t^o}2CO_2+2H_2O\)

   0,025    0,05

   \(CH_4+2O_2\underrightarrow{t^o}CO_2+2H_2O\)

   0,1       0,2

   \(\Rightarrow\Sigma n_{O_2}=0,05+0,2=0,25mol\)

   \(\Rightarrow V_{O_2}=0,25\cdot22,4=5,6l\Rightarrow V_{kk}=5V_{O_2}=28l\)

\(C_2H_2+2Br_2->C_2H_2Br_4\\ n_{hh}=\dfrac{3,36}{22,4}=0,15mol\\ n_{CH_4}=\dfrac{2,24}{22,4}=0,1mol\\ n_{C_2H_2}=0,05mol\\ n_{Br_2}=2.0,05=0,1mol\\ m_{Br_2}=0,1.160=16g\\ \%V_{CH_4}=\dfrac{0,1}{0,15}.100\%=66,67\%\\ \%V_{C_2H_2}=33,33\%\)

nBr2 = 32/160 = 0,2 (mol)

PTHH: C2H4 + Br2 -> C2H4Br2

Mol: 0,2 <--- 0,2

nhh khí = 44,8/22,4 = 2 (mol)

%VC2H4 = 0,2/2 = 10%

%VCH4 = 100% - 10% = 90%

a, nBr2 = 8/160 = 0,05 (mol)

PTHH: C2H4 + Br2 -> C2H4Br2

Mol: 0,05 <--- 0,05 <--- 0,05

Vhh khí = 2,8/22,4 = 0,125 (mol)

%VC2H4 = 0,05/0,125 = 40%

%CH4 = 100% - 40% = 60%

b, nCH4 = 0,125 - 0,05 = 0,075 (mol)

PTHH: C2H4 + 3O2 -> (t°) 2CO2 + 2H2O

Mol: 0,05 ---> 0,15

CH4 + 2O2 -> (t°) CO2 + 2H2O

Mol: 0,075 ---> 0,15

Vkk = (0,15 + 0,15) . 5 . 22,4 = 33,6 (l)