\(Đặt:n_{C_2H_4}=a\left(mol\right);n_{C_3H_6}=b\left(mol\right)\left(a,b>0\right)\\ C_2H_4+Br_2\rightarrow C_2H_4Br_2\\ C_3H_6+Br_2\rightarrow C_3H_6Br_2\\ m_{tăng}=m_{hh.ban.đầu}=7,7\left(g\right)\\ \Rightarrow Hpt:\left\{{}\begin{matrix}28a+42b=7,7\\a+b=0,2\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}a=0,05\\b=0,15\end{matrix}\right.\)

Vì thể tích tỉ lệ thuận với số mol nên ta có:

\(\%V_{C_2H_4\left(đktc\right)}=\%n_{C_2H_4}=\dfrac{a}{a+b}.100\%=\dfrac{0,05}{0,2}.100=25\%\\ \Rightarrow\%V_{C_3H_6}=100\%-25\%=75\%\)

Ai giúp e với ạ

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

\(\Rightarrow n_{C_2H_4}=0,05mol\Rightarrow m_{C_2H_4}=1,4g\)

\(\%m_{C_2H_4}=\dfrac{1,4}{2}\cdot100\%=70\%\)

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

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

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

\(n_{Br_2}=\dfrac{32}{160}=0,2mol\Rightarrow n_{etilen}=0,2mol\)

\(n_{hh}=\dfrac{11,2}{22,4}=0,5mol\Rightarrow n_{metan}=0,5-0,2=0,3mol\)

\(\%m_{etilen}=\dfrac{0,2\cdot28}{0,2\cdot18+0,3\cdot16}\cdot100\%=53,85\%\)

\(\%m_{metan}=100\%-53,85\%=46,15\%\)

Ta có: \(n_{Br_2}=\dfrac{48}{160}=0,3\left(mol\right)\)

PT: \(C_2H_2+2Br_2\rightarrow C_2H_2Br_4\)

____0,15___0,3 (mol)

\(\Rightarrow\left\{{}\begin{matrix}V_{C_2H_2}=0,15.22,4=3,36\left(l\right)\\V_{CH_4}=2,24\left(l\right)\end{matrix}\right.\)

Bạn tham khảo nhé!

$C_2H_2+2Br_2\to Br_2CH-CHBr_2$

$n_{Br_2}=\dfrac{48}{160}=0,3(mol)$

$\Rightarrow n_{C_2H_2}=\dfrac{n_{Br_2}}{2}=0,15(mol)$

$\Rightarrow V_{C_2H_2}=0,15.22,4=3,36(l)$

$\Rightarrow V_{CH_4}=5,6-3,36=2,24(l)$

\(a,n_{hhkhí\left(C_2H_4,C_2H_2\right)}=\dfrac{6,72}{22,4}=0,3\left(mol\right)\\ n_{Br_2}=\dfrac{80}{160}=0,5\left(mol\right)\\ Gọi\left\{{}\begin{matrix}n_{C_2H_4}=a\left(mol\right)\\n_{C_2H_2}=b\left(mol\right)\end{matrix}\right.\\ PTHH:C_2H_4+Br_2\rightarrow C_2H_4Br_2\\ Mol:a\rightarrow a\\ C_2H_2+2Br_2\rightarrow C_2H_2Br_4\\ Mol:b\rightarrow2b\\ Hệ.pt\left\{{}\begin{matrix}a+b=0,3\\a+2b=0,5\end{matrix}\right.\\ \Leftrightarrow\left\{{}\begin{matrix}a=0,1\left(mol\right)\\b=0,2\left(mol\right)\end{matrix}\right.\\ \%V_{C_2H_4}=\dfrac{0,1}{0,3}=33,33\%\\ \%V_{C_2H_2}=100\%-33,335=66,67\%\)

\(b,PTHH:\\ C_2H_4+3O_2\underrightarrow{t^o}2CO_2+2H_2O\\ Mol:0,1\rightarrow0,3\rightarrow0,2\\ 2C_2H_2+5O_2\underrightarrow{t^o}4CO_2+2H_2O\\ Mol:0,2\rightarrow0,25\rightarrow0,4\\ n_{CO_2}=0,2+0,4=0,6\left(mol\right)\\ PTHH:Ca\left(OH\right)_2+CO_2\rightarrow CaCO_3+H_2O\\ Mol:0,6\rightarrow0,6\rightarrow0,6\\ m_{CaCO_3}=0,6.100=60\left(g\right)\)

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

\(C_2H_2+2Br_2\rightarrow C_2H_2Br_4\)

Ta có: \(n_{C_2H_4}+n_{C_2H_2}=\dfrac{5,6}{22,4}=0,25\left(mol\right)\left(1\right)\)

Theo PT: \(n_{Br_2}=n_{C_2H_4}+2n_{C_2H_2}=\dfrac{48}{160}=0,3\left(mol\right)\left(2\right)\)

Từ (1) và (2) \(\Rightarrow\left\{{}\begin{matrix}x=0,2\left(mol\right)\\y=0,05\left(mol\right)\end{matrix}\right.\)

\(\Rightarrow\left\{{}\begin{matrix}\%V_{C_2H_4}=\dfrac{0,2.22,4}{5,6}.100\%=80\%\\\%V_{C_2H_2}=20\%\end{matrix}\right.\)

b, \(V_{ddBr_2}=\dfrac{0,3}{0,25}=1,2\left(M\right)\)

a) 

C₂H₄ + Br₂ --> C₂H₄Br₂

C₂H₂ + 2Br₂ --> C₂H₂Br₄

b) Gọi số mol C₂H₄, C₂H₂ là a, b (mol)

=> \(a+b=\dfrac{11,2}{22,4}=0,5\) (1)

PTHH: C₂H₄ + Br₂ --> C₂H₄Br₂

                a---->a

             C₂H₂ + 2Br₂ --> C₂H₂Br₄

                b---->2b

=> a + 2b = \(\dfrac{112}{160}=0,7\) (2)

(1)(2) => a = 0,3 (mol); b = 0,2 (mol)

\(\left\{{}\begin{matrix}\%V_{C_2H_4}=\dfrac{0,3}{0,5}.100\%=60\%\\\%V_{C_2H_2}=\dfrac{0,2}{0,5}.100\%=40\%\end{matrix}\right.\)

\(\left\{{}\begin{matrix}\%m_{C_2H_4}=\dfrac{0,3.28}{0,3.28+0,2.26}.100\%=61,765\%\\\%m_{C_2H_2}=\dfrac{0,2.26}{0,3.28+0,2.26}.100\%=38,235\%\end{matrix}\right.\)