a) \(n_{C_2H_4Br_2}=\dfrac{37,6}{188}=0,2\left(mol\right)\)

PTHH: C₂H₄ + Br₂ ---> C₂H₄Br₂
             0,2<---0,2<------0,2

b) \(\left\{{}\begin{matrix}V_{C_2H_4}=0,2.24,79=4,958\left(l\right)\\V_{CH_4}=20-4,958=15,042\left(l\right)\end{matrix}\right.\)

c) \(\left\{{}\begin{matrix}\%V_{C_2H_4}=\dfrac{4,958}{20}.100\%=24,79\%\\\%V_{CH_4}=100\%-24,79\%=75,21\%\end{matrix}\right.\)

d) \(V_{\text{dd}Br_2}=\dfrac{0,2}{0,2}=1\left(l\right)\)

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

b, \(n_{C_2H_4Br_2}=\dfrac{37,6}{188}=0,2\left(mol\right)\)

\(n_{C_2H_4}=n_{C_2H_4Br_2}=0,2\left(mol\right)\Rightarrow V_{C_2H_4}=0,2.22,4=4,48\left(l\right)\)

\(\Rightarrow V_{CH_4}=20-4,48=15,52\left(l\right)\)

c, \(\left\{{}\begin{matrix}\%V_{C_2H_4}=\dfrac{4,48}{20}.100\%=22,4\%\\\%V_{CH_4}=77,6\%\end{matrix}\right.\)

d, \(n_{Br_2}=n_{C_2H_4Br_2}=0,2\left(mol\right)\Rightarrow V_{ddBr_2}=\dfrac{0,2}{0,2}=1\left(l\right)\)

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

b, \(n_{C_2H_4Br_2}=\dfrac{1,88}{188}=0,01\left(mol\right)\)

Theo PT: \(n_{C_2H_4}=n_{C_2H_4Br_2}=0,01\left(mol\right)\Rightarrow V_{C_2H_4}=0,01.22,4=0,224\left(l\right)\)

\(\Rightarrow V_{CH_4}=20-0,224=19,776\left(l\right)\)

c, \(\left\{{}\begin{matrix}\%V_{C_2H_4}=\dfrac{0,224}{20}.100\%=1,12\%\\\%V_{CH_4}=98,88\%\end{matrix}\right.\)

d, \(n_{Br_2}=n_{C_2H_4Br_2}=0,01\left(mol\right)\Rightarrow C_{M_{Br_2}}=\dfrac{0,01}{0,2}=0,05\left(M\right)\)

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

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

            0,025<-0,125

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

a) Khí thoát ra là CH₄

\(\%V_{CH_4} = \dfrac{6,72}{13,44}.100\% = 50\%\\ \%V_{C_2H_4} = 100\% -50\% = 50\%\\ b)\\ C_2H_4 + Br_2 \to C_2H_4Br_2\\ n_{Br_2} = n_{C_2H_4}= \dfrac{13,44.50\%}{22,4} = 0,3(mol)\\ C_{M_{Br_2}} = \dfrac{0,3}{0,2} = 1,5M\)

a) 

\(n_{Br_2}=\dfrac{8}{160}=0,05\left(mol\right)\)

PTHH: C₂H₄ + Br₂ --> C₂H₄Br₂

           0,05<--0,05

=> \(V_{C_2H_4}=0,05.22,4=1,12\left(l\right)\)

=> \(V_{CH_4}=4,48-1,12=3,36\left(l\right)\)

b) \(\left\{{}\begin{matrix}\%V_{C_2H_4}=\dfrac{1,12}{4,48}.100\%=25\%\\\%V_{CH_4}=\dfrac{3,36}{4,48}.100\%=75\%\end{matrix}\right.\)

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

b) Ta có: \(n_{Br_2}=\dfrac{11,2}{160}=0,07\left(mol\right)=n_{C_2H_4}\)

\(\Rightarrow\%V_{C_2H_4}=\dfrac{0,07\cdot22,4}{1,72}\cdot100\%\approx91,16\%\) 

\(\Rightarrow\%V_{CH_4}=8,84\%\)

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) \(n_{CH_4}=\dfrac{3,36}{22,4}=0,15\left(mol\right)\)

=> \(\%V_{CH_4}=\dfrac{3,36}{11,2}.100\%=30\%\)

=> \(\%V_{C_2H_4}=100\%-30\%=70\%\)

b) \(n_{C_2H_4}=\dfrac{11,2.70\%}{22,4}=0,35\left(mol\right)\)

PTHH: CH₄ + 2O₂ --t^o--> CO₂ + 2H₂O

           0,15-->0,3

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

             0,35-->1,05

=> n_O2 = 0,3 + 1,05 = 1,35 (mol)

=> V_O2 = 1,35.22,4 = 30,24 (l)