a) 

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

PTHH: C₂H₄ + Br₂ --> C₂H₄Br₂

           0,05<--0,05

=> \(V_{C_2H_4}=0,05.22,4=1,12\left(l\right)\)

=> \(V_{CH_4}=4,48-1,12=3,36\left(l\right)\)

b) \(\left\{{}\begin{matrix}\%V_{C_2H_4}=\dfrac{1,12}{4,48}.100\%=25\%\\\%V_{CH_4}=\dfrac{3,36}{4,48}.100\%=75\%\end{matrix}\right.\)

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

\(n_{C_2H_4Br_2}=\frac{9,4}{188}=0,05\left(mol\right)\)

\(\Rightarrow n_{Br_2}=0,05\left(mol\right);n_{C_2H_4}=0,05\left(mol\right)\)

\(V_{Br_2}=0,05.22,4=1,12\left(l\right)\)

\(V_{C_2H_4}=0,05.22,4=1,12\left(l\right)\)

\(\%V_{C_2H_4}=\frac{1,12}{4,48}.100=25\%\)

\(\%V_{CH_4}=100\%-25\%=75\%\)

\(a,n_{C_2H_4Br_2}=\dfrac{9,4}{188}=0,05\left(mol\right)\\ PTHH:C_2H_4+Br_2\rightarrow C_2H_4Br_2\\ Mol:0,05\leftarrow0,05\leftarrow0,05\\ V_{Br_2}=\dfrac{0,05}{0,1}=0,5\left(l\right)=500\left(ml\right)\)

\(b,\%V_{C_2H_4}=\dfrac{0,05.22,4}{4,48}=25\%\\ \%V_{CH_4}=100\%-25\%=75\%\)

a, Cho hỗn hợp khí CH₄ và C₂H₄ qua dung dịch Br₂ dư chỉ có C₂H₄ tham gia phản ứng. PTHH: \(C_2H_4+Br_2\rightarrow C_2H_4Br_2\)

b, \(n_{Br_2}=\dfrac{m_{Br_2}}{M_{Br_2}}=\dfrac{64}{160}=0,4(mol)\)

Theo PTHH: \(n_{C_2H_4}=n_{Br_2}=0,4(mol)\)

\(V_{C_2H_4}=n_{C_2H_4}.22,4=0,4.22,4=8,96(l)\)

Phần trăm của khí C₂H₄ trong hỗn hợp ban đầu là: \(\%V_{C_2H_4}=\dfrac{V_{C_2H_4}}{V_hh}.100\%=\dfrac{8,96}{11,2}.100\%=80\%\)

Phần trăm của khí CH₄ trong hỗn hợp ban đầu là: 

\(\%V_{CH_4}=100\%-\%V_{C_2H_4}=100\%-80\%=20\%\)

a) 

PTHH: C₂H₂ + 2Br₂ --> C₂H₂Br₄

Khí thoát ra là CH₄

\(n_{CH_4}=\dfrac{4,48}{22,4}=0,2\left(mol\right)\)

\(n_{C_2H_2}=\dfrac{6,72}{22,4}-0,2=0,1\left(mol\right)\)

\(\left\{{}\begin{matrix}\%m_{CH_4}=\dfrac{0,2.16}{0,2.16+0,1.26}.100\%=55,17\%\\\%m_{C_2H_2}=\dfrac{0,1.26}{0,2.16+0,1.26}.100\%=44,83\%\end{matrix}\right.\)

b) 

PTHH: C₂H₂ + 2Br₂ --> C₂H₂Br₄

              0,1--->0,2

=> m_Br2 = 0,2.160 = 32 (g)

ta có :

nBr2=\(\dfrac{16}{160}=0,1mol\)

C2H4+Br2->C2H4Br2

0,1------0,1

=>VC2H4=0,1.22,4=2,24l

=>VCH4=3,36l->n CH4=0,15 mol

->%VC2H4=\(\dfrac{2,24}{5,6}.100\)=40%

=>%VCH4=60%

c)

CH4+2O2-to>CO2+2H2O

0,15---------------0,15

C2H4+3O2--to>2CO2+2H2O

0,1--------------------0,2
=>m CaCO3=0,35.100=35g

?? số liệu

a) \(n_{C_2H_4Br_2}=\dfrac{18,8}{188}=0,1\left(mol\right)\)

PTHH: C₂H₄ + Br₂ --> C₂H₄Br₂

            0,1<----0,1<---0,1

=> \(m_{Br_2}=0,1.160=16\left(g\right)\)

b)

\(\%V_{C_2H_4}=\dfrac{0,1.22,4}{4}.100\%=56\%\)

=> \(\%V_{CH_4}=100\%-56\%=44\%\)

c) \(n_{CH_4}=\dfrac{4.44\%}{22,4}=\dfrac{11}{140}\left(mol\right)\)

PTHH: CH₄ + 2O₂ --t^o--> CO₂ + 2H₂O

          \(\dfrac{11}{140}\)-->\(\dfrac{11}{70}\)

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

           0,1---->0,3

=> \(V_{O_2}=\left(\dfrac{11}{70}+0,3\right).22,4=10,24\left(l\right)\)

=> V_kk = 10,24.5 = 51,2 (l)

a) 

\(C_2H_2+2Br_2\rightarrow C_2H_2Br_4\)

\(C_2H_4+Br_2\rightarrow C_2H_4Br_2\)

b) 

Gọi số mol C₂H₂, C₂H₄ là a, b

=> \(a+b=\dfrac{2,24}{22,4}=0,1\left(mol\right)\)

\(n_{Br_2}=\dfrac{22,4}{160}=0,14\left(mol\right)\)

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

              a---->2a

          \(C_2H_4+Br_2\rightarrow C_2H_4Br_2\)

              b--->b

=> 2a + b = 0,14

=> a = 0,04; b = 0,06

\(\left\{{}\begin{matrix}\%V_{C_2H_2}=\dfrac{0,04}{0,1}.100\%=40\%\\\%V_{C_2H_4}=\dfrac{0,06}{0,1}.100\%=60\%\end{matrix}\right.\)