nBr2 = 32/160 = 0,2 (mol)

PTHH: C2H4 + Br2 -> C2H4Br2

Mol: 0,2 <--- 0,2

VC2H4 = 0,2 . 22,4 = 4,48 (l)

%VC2H4 = 4,48/6,2 = 72,25%

%VCH4 = 100% - 72,25% = 27,75%

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

b, - Khí thoát ra là CH₄.

⇒ V_CH4 = 4,48 (l)

\(\Rightarrow\left\{{}\begin{matrix}\%V_{CH_4}=\dfrac{4,48}{11,2}.100\%=40\%\\\%V_{C_2H_4}=100-40=60\%\end{matrix}\right.\)

\(n_{C_2H_4Br_2}=\dfrac{9,4}{188}=0,05mol\)

\(n_{hh}=\dfrac{5,6}{22,4}=0,25mol\)

\(C_2H_4+Br_2\rightarrow C_2H_4Br_2\)

0,05       0,05         0,05           ( mol )

\(m_{Br_2}=0,05.160=8g\)

\(\left\{{}\begin{matrix}\%V_{C_2H_4}=\dfrac{0,05}{0,25}.100=20\%\\\%V_{CH_4}=100\%-20\%=80\%\end{matrix}\right.\)

\(a,n_{Br_2}=\dfrac{6,4}{160}=0,04\left(mol\right)\)

PTHH: C₂H₄ + Br₂ ---> C₂H₄Br₂

           0,04<---0,04

\(\rightarrow\left\{{}\begin{matrix}V_{C_2H_4}=0,04.22,4=0,896\left(l\right)\\V_{CH_4}=2,24-0,896=1,344\left(l\right)\end{matrix}\right.\\ b,\rightarrow\left\{{}\begin{matrix}\%V_{C_2H_4}=\dfrac{0,896}{2,24}.100\%=40\%\\\%V_{CH_4}=100\%-40\%=60\%\end{matrix}\right.\)

nBr2 = 32/160 = 0,2 (mol)

PTHH: C2H4 + Br2 -> C2H4Br2

Mol: 0,2 <--- 0,2

nhh khí = 44,8/22,4 = 2 (mol)

%VC2H4 = 0,2/2 = 10%

%VCH4 = 100% - 10% = 90%

- Do dung dịch brom dư, nên khí thoát ra là metan.

- Chọn đáp án A.

\(C_2H_2+2Br_2->C_2H_2Br_4\\ n_{hh}=\dfrac{3,36}{22,4}=0,15mol\\ n_{CH_4}=\dfrac{2,24}{22,4}=0,1mol\\ n_{C_2H_2}=0,05mol\\ n_{Br_2}=2.0,05=0,1mol\\ m_{Br_2}=0,1.160=16g\\ \%V_{CH_4}=\dfrac{0,1}{0,15}.100\%=66,67\%\\ \%V_{C_2H_2}=33,33\%\)

Khi dẫn X qua AgNO₃/NH₃ thì chỉ có propin phản ứng

CHΞC-CH₃ + AgNO₃ + NH₃  → AgCΞC-CH₃ ↓ +  NH₄NO₃  

nAgCΞC-CH₃ = \(\dfrac{29,4}{147}\)= 0,2 mol = nPropin

Nếu dẫn X qua bình đựng dd brom dư thì khối lượng bình tăng = mPropin + m Etilen

<=> 12,2 = mPropin + m Etilen

<=> 0,2.40 + mEtilen = 12,2

<=> mEtilen = 4,2 gam => nEtilen = 4.2:28 = 0,15 mol

nX = 10,08 : 22,4 = 0,45 mol

=> %V Etilen = \(\dfrac{0,15}{0,45}\).100% = 33,33% 

%V Propin = \(\dfrac{0,2}{0,45}\).100% = 44,44% 

=> %V Metan = 100 - 33,33 - 44,44 = 22,23%

a) Khí thoát ra là CH₄

 \(n_{CH_4}=\dfrac{3,7185}{24,79}=0,15\left(mol\right)\)

\(\left\{{}\begin{matrix}\%V_{CH_4}=\dfrac{3,7185}{14,874}.100\%=25\%\\\%V_{C_2H_4}=100\%-25\%=75\%\end{matrix}\right.\)

b) 

\(n_{C_2H_4}=\dfrac{14,874.75\%}{24,79}=0,45\left(mol\right)\)

PTHH: C₂H₄ + Br₂ --> C₂H₄Br₂

            0,45-->0,45

=> \(C_{M\left(dd.Br_2\right)}=\dfrac{0,45}{0,15}=3M\)

c) 

PTHH: CH₄ + 2O₂ --t^o--> CO₂ + 2H₂O

            0,15---------------------->0,3

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

             0,45------------------------->0,9

=> m_H2O = (0,3 + 0,9).18 = 21,6 (g)