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\(n_{C_2H_4Br_2}=\dfrac{9,4}{188}=0,05mol\)
\(n_{hh}=\dfrac{5,6}{22,4}=0,25mol\)
\(C_2H_4+Br_2\rightarrow C_2H_4Br_2\)
0,05 0,05 0,05 ( mol )
\(m_{Br_2}=0,05.160=8g\)
\(\left\{{}\begin{matrix}\%V_{C_2H_4}=\dfrac{0,05}{0,25}.100=20\%\\\%V_{CH_4}=100\%-20\%=80\%\end{matrix}\right.\)
nC2H4Br2 = \(\dfrac{4,7}{188}\)=0,025(mol)
C2H4 + Br2 -> C2H4Br2
0,025 <-----------0,025
=>VC2H4 = 0,025 . 22,4=0,56(l)
=> VCH4 = 2,8 - 0,56 =2,24 (l)
%VCH4 =\(\dfrac{2,24.100}{2,8}\)=80%
%VC2H4 = 100 % -80% = 20%
Bài 9 :
Metan không tác dụng với dung dịch Brom nên :
\(n_{C2H4Br2}=\dfrac{4,7}{188}=0,025\left(mol\right)\)
a) Pt : \(C_2H_4+Br_2\rightarrow C_2H_4Br_2|\)
1 1 1
0,025 0,025
b) \(n_{C2H4}=\dfrac{0,025.1}{1}=0,025\left(mol\right)\)
\(V_{C2H4\left(dktc\right)}=0,025.22,4=0,56\left(l\right)\)
\(\%V_{C2H4}=\dfrac{0,56.100}{2,8}=20\%\)
\(\%V_{CH4}=100\%-20\%=80\%\)
Chúc bạn học tốt
a, - Khí pư với Brom là C2H4
PT: \(C_2H_4+Br_2\rightarrow C_2H_4Br_2\)
b, Ta có: \(n_{Br_2}=\dfrac{16}{160}=0,1\left(mol\right)\)
Theo PT: \(n_{C_2H_4}=n_{Br_2}=0,1\left(mol\right)\)
\(\Rightarrow\left\{{}\begin{matrix}\%m_{C_2H_4}=\dfrac{0,1.28}{4}.100\%=70\%\\\%m_{CH_4}=100-70=30\%\end{matrix}\right.\)
a)\(m_{tăng}=m_{Br_2}=m_{C_2H_2}=0,78g\Rightarrow n_{C_2H_2}=0,03mol\)
\(n_{hh}=\dfrac{11,2}{22,4}=0,5mol\)
\(\Rightarrow n_{CH_4}=0,5-0,03=0,47mol\)
b)\(C_2H_2+2Br_2\rightarrow C_2H_2Br_4\)
0,03 0,03
\(m_{C_2H_2Br_4}=0,03\cdot266=7,98g\)
c)\(\%V_{C_2H_2}=\dfrac{0,03}{0,5}\cdot100\%=6\%\)
\(\%V_{CH_4}=100\%-6\%=94\%\)
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 )
\(V_{CO_2}=\left(0,2+0,2\right).22,4=8,96l\)
a) \(C_2H_4 + Br_2 \to C_2H_4Br_2\)
b)
\(n_{C_2H_4} = n_{Br_2} = \dfrac{5,6}{160} = 0,035(mol)\\ \%V_{C_2H_4} = \dfrac{0,035.22,4}{0,86}.100\% = 91,16\%\\ \%V_{CH_4} = 100\% - 91,16\% = 8,84\%\)
\(n_{C_2H_2Br_4}=\dfrac{17.3}{346}=0.05\left(mol\right)\)
\(C_2H_2+2Br_2\rightarrow C_2H_2Br_4\)
\(n_{C_2H_2}=0.05\left(mol\right)\)
\(m_{C_2H_2}=0.05\cdot26=1.3\left(g\right)\)
\(m_{CH_4}=4.33-1.3=3.03\left(g\right)\)
\(\%m_{C_2H_2}=\dfrac{1.3}{4.33}\cdot100\%=30.02\%\)
\(\%m_{CH_4}=69.98\%\)