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

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%

\(n_{Br_2}=\dfrac{4}{160}=0,025mol\)

\(C_2H_4+Br_2\rightarrow C_2H_4Br_2\)

0,025     0,025                     ( mol )

\(V_{hh}=\dfrac{2,8}{22,4}=0,125mol\)

\(\%V_{C_2H_4}=\dfrac{0,025}{0,125}.100=20\%\)

\(\%V_{CH_4}=100\%-20\%=80\%\)

Ai giúp e với ạ

a.b.\(m_{tăng}=m_{C_2H_4}=2,8g\)

\(n_{C_2H_4}=\dfrac{2,8}{28}=0,1mol\)

\(C_2H_4+Br_2\rightarrow C_2H_4Br_2\)

\(n_{hh}=\dfrac{6,72}{22,4}=0,3mol\)

\(\rightarrow m_{CH_4}=\left(0,3-0,1\right).16=3,2g\)

\(\rightarrow\left\{{}\begin{matrix}\%m_{C_2H_4}=\dfrac{2,8}{2,8+3,2}.100=46,67\%\\\%m_{CH_4}=100\%-46,67\%=53,33\%\end{matrix}\right.\)

c.\(CH_4+2O_2\rightarrow\left(t^o\right)CO_2+2H_2O\)

    0,2                            0,2                 ( mol )

\(C_2H_4+3O_2\rightarrow\left(t^o\right)2CO_2+2H_2O\)

  0,1                              0,2                ( mol )

\(V_{CO_2}=\left(0,2+0,2\right).22,4=8,96l\)

.

Tham khảo:

a. PTHH: C2H2 + 2Br2 ---> C2H4Br2 
Khí thoát ra là CH4 => nCH4 = 0,1 (mol) . Mà tổng n khí = 0,15 (mol) 
=> nC2H2 = 0,05 (mol) 
b. %V CH4 = 0,1/0,15 . 100% = 66,67% 
    %V C2H2 = 33,33%
c. CH4 + 2O2 ==> CO2 + 2H2O 
C2H2 + 5/2O2 ==> 2CO2 + H2O 
Tổng số mol của O2: 0,1.2 + 0,05. 2,5 = 0,325 (mol) 
=> V O2 = 0,325. 22,4 = 7,28 (l) 
=> V kk = 7,28 / 20% = 36,4 (l) 

\(n_{H_2O}=\dfrac{1,8}{18}=0,1mol\Rightarrow m_H=0,2g\)

\(n_{CO_2}=\dfrac{2,24}{22,4}=0,1mol\Rightarrow m_C=1,2g\)

Có \(m_C+m_H=m_A\Rightarrow A\) chỉ chứa C,H.

Gọi CTHH là \(C_xH_y\)

\(x:y=n_C:n_H=0,1:0,2=1:2\)

\(\Rightarrow CH_2\)

a) nC2H4Br2=47/188=0,25(mol)

n(CH4,C2H4)=11,2/22,4=0,5(mol)

PTHH: C2H4 + Br2 -> C2H4Br2

0,25<----------0,25<---------0,25(mol)

mBr2(p.ứ)=0,25 x 160= 40(g)

b) V(C2H4,đktc)=0,25 x 22,4= 5,6(l)

=> %V(C2H4)=(5,6/11,2).100=50%

=>%V(CH4)=100% - 50%= 50%

\(n_{hh}=\dfrac{3,36}{22,4}=0,15mol\)

\(n_{Br_2}=\dfrac{2,4}{160}=0,015mol\)

\(C_2H_2+2Br_2\rightarrow C_2H_2Br_4\)

0,0075  0,015                       ( mol )

\(V_{C_2H_2}=0,0075.22,4=0,168l\)

\(V_{CH_4}=3,36-0,168=3,192l\)

\(\%V_{C_2H_2}=\dfrac{0,168}{3,36}.100=5\%\)

\(\%V_{CH_4}=100\%-5\%=95\%\)

giúp vs nha cần lắm!!!

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)

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

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