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Bài 14 :
Vì metan không tác dụng với 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) \(n_{C2H4}=\dfrac{0,025.1}{1}=0,025\left(mol\right)\)
\(V_{C2H4\left(dktc\right)}=0,025.22,4=0,56\left(l\right)\)
\(V_{CH4\left(dktc\right)}=1,4-0,56=0,84\left(l\right)\)
0/0VCH4 = \(\dfrac{0,84.100}{1,4}=60\)0/0
0/0VC2H4 = \(\dfrac{0,56.100}{1,4}=40\)0/0
Chúc bạn học tốt
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
\(n_{hh}=6,72:22,4=0,3mol\\ C_2H_2+2Br_2->C_2H_2Br_4\\ C_2H_4+Br_2->C_2H_2Br_2\\ n_{Br_2}=0,4mol\\ n_{C_2H_2}=a;n_{C_2H_4}=b\\ a+b=0,3\\ 2a+b=0,4\\ a=0,2;b=0,1\\ \%V_{C_2H_2}=\dfrac{0,2}{0,3}.100\%=66,67\%\\ \%V_{C_2H_4}=33,33\%\)
1/2 hỗn hợp có 0,1 mol C2H2 và 0,05mol C2H4
\(BT.C:n_{CO_2}=2n_{C_2H_2}+2n_{C_2H_4}=0,3mol\\ n_{CaCO_3}=n_{CO_2}=0,3\\ m_{KT}=0,3.100=30g\)
\(n_{C_2H_4Br_2}=\dfrac{9,4}{188}=0,05mol\)
\(n_{hh}=\dfrac{5,6}{22,4}=0,25mol\)
\(C_2H_4+Br_2\rightarrow C_2H_4Br_2\)
0,05 0,05 0,05 ( mol )
\(m_{Br_2}=0,05.160=8g\)
\(\left\{{}\begin{matrix}\%V_{C_2H_4}=\dfrac{0,05}{0,25}.100=20\%\\\%V_{CH_4}=100\%-20\%=80\%\end{matrix}\right.\)
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%
1. \(n_{Br_2}=0,4.0,5=0,2\left(mol\right)\)
PT: \(C_2H_4+Br_2\rightarrow C_2H_4Br_2\)
Theo PT: \(n_{C_2H_4}=n_{Br_2}=0,2\left(mol\right)\Rightarrow V_{C_2H_4}=0,2.22,4=4,48\left(l\right)\)
2. \(n_{C_2H_4Br_2}=\dfrac{9,4}{188}=0,05\left(mol\right)\)
PT: \(C_2H_4+Br_2\rightarrow C_2H_4Br_2\)
Theo PT: \(n_{C_2H_4}=n_{C_2H_4Br_2}=0,05\left(mol\right)\)
\(\Rightarrow\%V_{C_2H_4}=\dfrac{0,05.22,4}{1,4}.100\%=80\%\)
\(\Rightarrow\%V_{CH_4}=100-80=20\%\)
\(a) C_2H_4 + Br_2 \to C_2H_4Br_2\\ n_{C_2H_4} = n_{Br_2} = \dfrac{48}{160} = 0,3(mol)\\ \%V_{C_2H_4} = \dfrac{0,3.22,4}{8,96}.100\% = 75\%\\ \%V_{CH_4} = 100\% -75\% = 25\%\\ b)\)
Khí còn lại : CH4
\(CH_4 + 2O_2 \xrightarrow{t^o} CO_2 + H_2O\\ n_{CO_2} = n_{CH_4} = \dfrac{8,96.25\%}{22,4} = 0,1(mol)\\ m_{CO_2} = 0,1.44 = 4,4(gam)\)
\(n_{hh}=\dfrac{6,72}{22,4}=0,3\left(mol\right)\\ n_{Br_2}=\dfrac{64}{160}=0,4\left(mol\right)\)
Gọi số mol của \(C_2H_4\) là: \(a\)
Gọi số mol của \(C_2H_2Br_4\) là: \(b\)
\(PTHH:\\ +)C_2H_2+2Br_2\rightarrow C_2H_2Br_4\\+)C_2H_4+Br_2\rightarrow C_2H_4Br_2 \)
\(\left\{{}\begin{matrix}a+b=0,3\\a+2b=0,4\end{matrix}\right.\)
\(\Rightarrow\left\{{}\begin{matrix}a=0,2\\b=0,1\end{matrix}\right.\)
\(\%V_{C_2H_4}=\dfrac{0,2}{0,3}.100\%=66,67\%\\ \%V_{C_2H_2}=100\%-66,67\%=33,33\%\)
\(n_{hh}=\dfrac{6,72}{22,4}=0,3mol\)
\(n_{C_2H_4Br_2}=\dfrac{16}{188}=\dfrac{4}{47}mol\)
\(\Rightarrow n_{etilen}=\dfrac{4}{47}mol\)
\(\Rightarrow n_{metan}=0,3-\dfrac{4}{47}=\dfrac{101}{470}mol\)
\(C_2H_4+Br_2\rightarrow C_2H_4Br_2\)
\(\%V_{etilen}=\dfrac{\dfrac{4}{47}}{0,3}\cdot100\%=28,37\%\)
\(\%V_{metan}=100\%-28,37\%=71,63\%\)