Sửa : 29,25 \(\to\) 29,55

\(C_2H_4 + Br_2 \to C_2H_4Br_2\\ n_{C_2H_4} = n_{Br_2} = \dfrac{8}{160} = 0,05(mol)\\ \Rightarrow m_{C_2H_4} = 0,05.28 = 1,4(gam)\\ CH_4 + 2O_2 \xrightarrow{t^o} CO_2 + 2H_2O\\ C_2H_4 +3O_2 \xrightarrow{t^o} 2CO_2 + 2H_2O\\ CO_2 + Ba(OH)_2 \to BaCO_3 + H_2O\\ n_{CO_2} = n_{CH_4} + 2n_{C_2H_4} = n_{CH_4} + 0,05.2 = n_{BaCO_3} = \dfrac{29,55}{197}=0,15(mol) \\ \Rightarrow n_{CH_4} = 0,05(mol)\\ \Rightarrow m_{CH_4} = 0,05.16 = 0,8(gam)\)

Đầu tiên, không có nước Br chỉ có nước Br2 em nhé!

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nBr2= 8/160=0,05(mol)

PTHH: C2H4 + Br2 -> C2H4Br2

nC2H4=nBr2=0,05(mol) => mC2H4=0,05.28=1,4(g)

- Khí bay ra là khí CH4.

CH4 + 2 O2 -to-> CO2 + 2 H2O

CO2 + Ba(OH)2 -> BaCO3 + H2O

nBaCO3=29,25/197= 117/ 788 (mol ) (Số xấu quá em ơi)

=> nCH4=nCO2=nBaCO3= 117/788(mol)

=> mCH4=16. 117/788= 468/197(g)

chất khí thoát ra là metan đó bạn sau đó bạn tíh số mol của metan => etylen

C2H4 + Br2 = C2H4Br2

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

b) Ta có: \(n_{Br_2}=\dfrac{11,2}{160}=0,07\left(mol\right)=n_{C_2H_4}\)

\(\Rightarrow\%V_{C_2H_4}=\dfrac{0,07\cdot22,4}{1,72}\cdot100\%\approx91,16\%\) 

\(\Rightarrow\%V_{CH_4}=8,84\%\)

a) \(C_2H_4 + Br_2 \to C_2H_4Br_2\)

b)

\(n_{C_2H_4} = n_{Br_2} = \dfrac{5,6}{160} = 0,035(mol)\\ \%V_{C_2H_4} = \dfrac{0,035.22,4}{0,86}.100\% = 91,16\%\\ \%V_{CH_4} = 100\% - 91,16\% = 8,84\%\)

a, \(C_2H_2+2Br_2\rightarrow C_2H_2Br_4\)

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

\(n_{C_2H_2}=\dfrac{1}{2}n_{Br_2}=0,025\left(mol\right)\Rightarrow m_{C_2H_2}=0,025.26=0,65\left(g\right)\)

b, \(\left\{{}\begin{matrix}\%V_{C_2H_2}=\dfrac{0,025.22,4}{33,6}.100\%\approx1,67\%\\\%V_{CH_4}\approx98,33\%\end{matrix}\right.\)

a, Khí tác dụng với dd Brom: C₂H₄.

b, Ta có: \(n_{Br_2}=\dfrac{8}{160}=0,05\left(mol\right)\)

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

Theo PT: \(n_{C_2H_4}=n_{Br_2}=0,05\left(mol\right)\Rightarrow m_{C_2H_4}=0,05.28=1,4\left(g\right)\)

C₂H₄+Br₂->C₂H₄Br₂

0,05----0,05

n _Br2=\(\dfrac{8}{160}\)=0,05 mol

=>%V_C2H4=\(\dfrac{0,05.22,4}{5,6}.100=20\%\)

=>%V_CH4=80%

c)CH₄+2O₂-to>CO₂+2H₂O

1.10^-3----2.10^-3 mol

C₂H₄+3O₂-to>2CO₂+2H₂O

2,5.10^-4-7,5.10^-4 mol

n hh=\(\dfrac{0,028}{22,4}\)=1,25.10^-3 mol

=>n _C2H4=2,5.10^-4 mol

=>n _CH4=1.10^-3 mol

=>V_O2=(2.10^-3+7,5.10^-4).22,4=0,0616l

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

\(\Rightarrow n_{etilen}=n_{Br_2}=0,05mol\)

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

\(\Rightarrow n_{metan}=n_{hh}-n_{etilen}=0,25-0,05=0,2mol\)

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

b)\(\%V_{metan}=\dfrac{0,2}{0,25}\cdot100\%=80\%\)

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

nBr2 = 16 / 160 = 0.1 (mol) 

nhh = 5.6 / 22.4 = 0.25 (mol ) 

C2H4 + Br2 => C2H4Br2 

0.1..........0.1

%VC2H4 = 40% 

\(n_{Br_2}=\dfrac{28}{160}=0,175\left(mol\right)\\ a,C_2H_4+Br_2\rightarrow C_2H_4Br_2\\ b,n_{C_2H_4}=n_{Br_2}=0,175\left(mol\right)\\ V_{C_2H_4}=0,175.22,4=3,92\left(l\right)\\ \%V_{C_2H_4}=\dfrac{3,92}{8,6}.100\approx45,581\%\\ \%V_{CH_4}\approx54.419\%\)

c, Thiếu dữ kiện