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

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)

a) Khí thoát ra là CH₄

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

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

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

            0,025<-0,125

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

m(tăng) = mC2H4 (tham gia p/ư) = 2,8 (g)

nC2H4 = 2,8/28 = 0,1 (mol)

VC2H4 = 0,1 . 22,4 = 2,24 (l)

VCH4 = 4,48 - 2,24 = 2,24 (l)

m_tăng = m_C2H4

=> \(n_{C_2H_4}=\dfrac{5,6}{28}=0,2\left(mol\right)\)

=> V_C2H4 = 0,2.22,4 = 4,48 (l)

=> V_CH4 = 6,72 - 4,48 = 2,24 (l)

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)

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