a) C₂H₄ + Br₂ --> C₂H₄Br₂

b) \(n_{Br_2}=\dfrac{24}{160}=0,15\left(mol\right)\)

PTHH: C₂H₄ + Br₂ --> C₂H₄Br₂

           0,15<--0,15----->0,15

=> \(\%V_{C_2H_4}=\dfrac{0,15.22,4}{7,84}.100\%=42,857\%\)

=> \(\%V_{CH_4}=\dfrac{7,84-0,15.22,4}{7,84}.100\%=57,143\%\)

c) m_C2H4Br2 = 0,15.188 = 28,2 (g)

n_Br2 = 2.0,25 = 0,5 (mol)

PTHH: C₂H₂ + 2Br₂ --> C₂H₂Br₄

             0,25<---0,5------>0,25

=> V_C2H2 = 0,25.22,4 = 5,6 (l)

m_C2H2Br4 = 0,25.346 = 86,5 (g)

\(n_{Br_2}=0,25\cdot2=0,5mol\)

\(C_2H_2+2Br_2\rightarrow C_2H_2Br_4\)

0,25        0,5           0,25

\(V_{C_2H_2}=0,25\cdot22,4=5,6l\)

\(m_{C_2H_2Br_4}=0,25\cdot346=86,5g\)

C2H2+2Br2->C2H2Br4

0,25---0,5-------0,25 mol

n Br2=0,5 mol

=>VC2H2=0,25.22,4=5,6l

=>mC2H2Br4=0,25.346=86,5g

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

Ta có: \(n_{Br_2}=\dfrac{16}{160}=0,1\left(mol\right)\)

Theo PT: \(n_{C_2H_4Br_2}=n_{Br_2}=0,1\left(mol\right)\Rightarrow m_{C_2H_4Br_2}=0,1.188=18,8\left(g\right)\)

b, Theo PT: \(n_{C_2H_4}=n_{Br_2}=0,1\left(mol\right)\Rightarrow n_{ankan}=\dfrac{6,72}{22,4}-0,1=0,2\left(mol\right)\)

Gọi CTPT của ankan là C_nH_2n+2.

PT: \(C_nH_{2n+2}+\dfrac{3n+1}{2}O_2\underrightarrow{t^o}nCO_2+\left(n+1\right)H_2O\)

\(C_2H_4+3O_2\underrightarrow{t^o}2CO_2+2H_2O\)

Theo PT: \(n_{H_2O}=\left(n+1\right)n_{C_nH_{2n+2}}+2n_{C_2H_4}=\left(n+1\right).0,2+2.0,1=\dfrac{14,4}{18}\)

\(\Rightarrow n=2\)

Vậy: CTPT cần tìm là C₂H₆

Chọn D

C₂H₂ + AgNO₃ -> Ag₂C₂↓

=> n_{kết tủa} = n_C2H2  =0,04 mol

,m_{bình tăng} = m_C2H2 + m_C2H4 = 2,72g => n_C2H4 = 0,06 mol

Đốt cháy : n_CO2 = 2n_C2H2 + 2n_C2H4 = 0,2 mol

n_OH = 0,15 mol < n_CO2

=> phản ứng chỉ tạo HCO₃ với số mol là 0,15 mol

$C_2H_2 + 2AgNO_3 + 2NH_3 \to Ag_2C_2 + 2NH_4NO_3$

Theo PTHH :

n C2H2 = n Ag2C2 = 48/240 = 0,2(mol)

$C_2H_4 + Br_2 \to C_2H_4Br_2$
$C_2H_2 + 2Br_2 \to C_2H_2Br_4$

n Br2 = 2n C2H2 + n C2H4 = 80/160 = 0,5(mol)

=> n C2H4 = 0,5 - 0,2.2 = 0,1(mol)

Vậy :

%V C2H2 = 0,2.22,4/8,96  .100% = 50%

%V C2H4 = 0,1.22,4/8,96  .100% = 25%
%V CH4 = 100% -50% - 25% = 25%

\(m_{tăng}=m_{C_2H_4}=5.6\left(g\right)\)

\(m_{CH_4}=8.8-5.6=3.2\left(g\right)\)

\(C_2H_4+Br_2\rightarrow C_2H_4Br_2\)

\(\%CH_4=\dfrac{3.2}{8.8}\cdot100\%=36.36\%\)

\(\%C_2H_4=100-36.36=63.64\%\)

\(m_{C_2H_4Br_2}=188\cdot0.2=37.6\left(g\right)\)

\(n_{hh}=6,72:22,4=0,3mol\\ C_2H_2+2Br_2->C_2H_2Br_4\\ C_2H_4+Br_2->C_2H_2Br_2\\ n_{Br_2}=0,4mol\\ n_{C_2H_2}=a;n_{C_2H_4}=b\\ a+b=0,3\\ 2a+b=0,4\\ a=0,2;b=0,1\\ \%V_{C_2H_2}=\dfrac{0,2}{0,3}.100\%=66,67\%\\ \%V_{C_2H_4}=33,33\%\)

1/2 hỗn hợp có 0,1 mol C2H2 và 0,05mol C2H4

\(BT.C:n_{CO_2}=2n_{C_2H_2}+2n_{C_2H_4}=0,3mol\\ n_{CaCO_3}=n_{CO_2}=0,3\\ m_{KT}=0,3.100=30g\)

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

\(C_2H_2+2Br_2\rightarrow C_2H_2Br_4\)

b, Ta có: \(n_{C_2H_4}+n_{C_2H_2}=\dfrac{0,56}{22,4}=0,025\left(mol\right)\) (1)

Theo PT: \(n_{Br_2}=n_{C_2H_4}+2n_{C_2H_2}=\dfrac{5,6}{160}=0,035\left(mol\right)\) (2)

Từ (1) và (2) \(\Rightarrow\left\{{}\begin{matrix}n_{C_2H_4}=0,015\left(mol\right)\\n_{C_2H_2}=0,01\left(mol\right)\end{matrix}\right.\)

\(\Rightarrow\left\{{}\begin{matrix}m_{C_2H_4}=0,015.28=0,42\left(g\right)\\m_{C_2H_2}=0,01.26=0,26\left(g\right)\end{matrix}\right.\)

c, \(CaC_2+2H_2O\rightarrow Ca\left(OH\right)_2+C_2H_2\)

Theo PT: \(n_{CaC_2}=n_{C_2H_2}=0,01\left(mol\right)\Rightarrow m_{CaC_2}=0,01.64=0,64\left(g\right)\)