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

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

Gọi số mol C₂H₄, C₂H₂ là a, b (mol)

=> a + b = \(\dfrac{0,672}{22,4}=0,03\left(mol\right)\) (1)

PTHH: C₂H₄ + Br₂ --> C₂H₄Br₂

                a-------------->a

             C₂H₂ + 2Br₂ --> C₂H₂Br₄

                b----------------->b

=> 188a + 346b = 8,8 (2)

(1)(2) => a = 0,01 (mol); b = 0,02 (mol)

=> \(\left\{{}\begin{matrix}\%V_{C_2H_4}=\dfrac{0,01}{0,03}.100\%=33,33\%\\\%V_{C_2H_2}=\dfrac{0,02}{0,03}.100\%=66,67\%\end{matrix}\right.\)

a) \(n_{Br_2\left(p\text{ư}\right)}=\dfrac{200.8\%}{160}=0,1\left(mol\right);n_{hh}=\dfrac{7,437}{24,79}=0,3\left(mol\right)\)

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

             0,1<-----0,1

b) \(\left\{{}\begin{matrix}\%V_{C_2H_4}=\dfrac{0,1}{0,3}.100\%=33,33\%\\\%V_{CH_4}=100\%-33,33\%=66,67\%\end{matrix}\right.\)

c) \(n_{CH_4}=0,3-0,1=0,2\left(mol\right)\)

PTHH: \(CH_4+2O_2\xrightarrow[]{t^o}CO_2+2H_2O\)

             0,2--->0,4

            \(C_2H_4+3O_2\xrightarrow[]{t^o}2CO_2+2H_2O\)

              0,1--->0,3

\(\Rightarrow V_{O_2}=\left(0,3+0,4\right).24,79=17,353\left(l\right)\)

\(n_{hh}=\dfrac{6,72}{22,4}=0,3\left(mol\right)\\ n_{Br_2}=\dfrac{64}{160}=0,4\left(mol\right)\)

Gọi số mol của \(C_2H_4\) là: \(a\)

Gọi số mol của \(C_2H_2Br_4\) là: \(b\)

\(PTHH:\\ +)C_2H_2+2Br_2\rightarrow C_2H_2Br_4\\+)C_2H_4+Br_2\rightarrow C_2H_4Br_2 \)

\(\left\{{}\begin{matrix}a+b=0,3\\a+2b=0,4\end{matrix}\right.\)

\(\Rightarrow\left\{{}\begin{matrix}a=0,2\\b=0,1\end{matrix}\right.\)

\(\%V_{C_2H_4}=\dfrac{0,2}{0,3}.100\%=66,67\%\\ \%V_{C_2H_2}=100\%-66,67\%=33,33\%\)

C2H4 + Br2 -> C2H4Br2

  a          a            a

C2H2 + 2Br2 -> C2H2Br4

   b          2b             b

n hỗn hợp khí = \(\dfrac{7.84}{22.4}=0.35mol\)

Ta có: \(\left\{{}\begin{matrix}a+b=0.35\\160a+320b=72\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}a=0.25mol\\b=0.1mol\end{matrix}\right.\)

\(\%VC2H4=\dfrac{0.25\times22.4\times100}{7.84}=71.43\%\)

%VC2H2 = 100 - 71.43 = 28.57%

C2H4 + Br2 -> C2H4Br2

  a          a            a

C2H2 + 2Br2 -> C2H2Br4

   b          2b             b

n hỗn hợp khí = %VC2H4=0.25×22.4×1007.84=71.43%%VC2H4=0.25×22.4×1007.84=71.43%

%VC2H2 = 100 - 71.43 = 28.57%

nhh = 5.6/22.4 = 0.25(mol) 

nAg2C2 = nC2H2 = 24/240 = 0.1 (mol) 

nBr2 = 0.3 (mol) 

=> nC2H4 = 0.3 - 0.1*2 = 0.1 (mol) 

nCH4 = 0.25 - 0.1 - 0.1 = 0.05 (mol) 

mCH4 = 0.05*16 = 0.8 (g) 

mC2H2 = 0.1*26 = 2.6 (g) 

mC2H4 = 0.1*28 = 2.8 (g)

mhh = 0.8 + 2.6 + 2.8 = 6.2 (g)  

%CH4 = 0.8/6.2 * 100% = 12.9%

%C2H4 = 2.8/ 6.2 * 100% = 45.16%

%C2H2 = 41.94%

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

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

            0,025<-0,125

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

\(n_{Br_2}=\dfrac{1,92}{160}=0,012\left(mol\right)\)

Gọi số mol C₂H₄, C₂H₂ là a, b (mol)

=> \(a+b=\dfrac{0,224}{22,4}=0,01\) (1)

PTHH: C₂H₄ + Br₂ --> C₂H₄Br₂

               a---->a

             C₂H₂ + 2Br₂ --> C₂H₂Br₄

                 b----->2b

=> a + 2b = 0,012 (2)

(1)(2) => a = 0,008 (mol); b = 0,002 (mol)

=> \(\left\{{}\begin{matrix}\%V_{C_2H_4}=\dfrac{0,008}{0,01}.100\%=80\%\\\%V_{C_2H_2}=100\%-80\%=20\%\end{matrix}\right.\)