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

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

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

            0,025<-0,125

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

 Tại sao dưới C₂H₄ lại ra lại ra 0,025 vậy

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)

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

Cho 1,72 lít hỗn hợp khí gồm metan và etilen (đktc) lội qua dd brom dư lượng brom tham gia phản ứng là 11,2 gam

a. Viết PTHH?

b. Tính thành phần phần trăm về thể tích mỗi khí trong hỗn hợp ?

a)

Khí thoát ra: CH₄

\(\%V_{CH_4} = \dfrac{6,72}{16,8}.100\% = 40\%\\ \%V_{C_2H_4} = 100\% - 40\% = 60\%\)

b)

\(n_{C_2H_4} = \dfrac{16,8-6,72}{22,4} = 0,45(mol)\\ C_2H_4 + Br_2 \to C_2H_4Br_2\\ n_{Br_2} = n_{C_2H_4} = 0,45(mol)\\ \Rightarrow C_{M_{Br_2}} = \dfrac{0,45}{2} = 0,225M\\ c) n_{C_2H_4Br_2} = n_{C_2H_4} = 0,45(mol)\\ \Rightarrow n_{C_2H_4Br_2} = 0,45.188 = 84,6(gam)\)

Bài 4:

a) n(hỗn hợp khí)= 16,8/22,4=0,75(mol)

- Khí thoát ra là khí CH4.

=> nCH4=6,72/22,4=0,3(mol)

nC2H4=0,75-0,3=0,45(mol)

- Số mol tỉ lệ thuận với thể tích.

%V(CH4)=%nCH4= (0,3/0,75).100=40%

=> %V(C2H4)=100% - 40%=60%

b) PTHH: C2H4 + Br2 -> C2H4Br2

nC2H4Br2= nBr2=nC2H4=0,45(mol)

=>VddBr2= 0,45/2=0,225(l)

c) mC2H4Br2=0,45. 188= 84,6(g)