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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 --to--> CO2 + 2H2O
\(\dfrac{11}{140}\)-->\(\dfrac{11}{70}\)
C2H4 + 3O2 --to--> 2CO2 + 2H2O
0,1---->0,3
=> \(V_{O_2}=\left(\dfrac{11}{70}+0,3\right).22,4=10,24\left(l\right)\)
=> Vkk = 10,24.5 = 51,2 (l)
\(n_{hh}=\dfrac{2,8}{22,4}=0,125mol\)
\(\left\{{}\begin{matrix}n_{etilen}=x\left(mol\right)\\n_{metan}=y\left(mol\right)\end{matrix}\right.\)
\(m_{Br_2}=4g\Rightarrow n_{Br_2}=0,025mol\)
\(C_2H_4+Br_2\rightarrow C_2H_4Br_2\)
0,025 0,025 0,025
a)\(m_{C_2H_4Br_2}=0,025\cdot188=4,7g\)
b)\(n_{CH_4}=0,125-0,025=0,1mol\)
\(\%m_{CH_4}=\dfrac{0,1\cdot16}{0,1\cdot16+0,025\cdot28}\cdot100\%=69,57\%\)
\(\%m_{C_2H_2}=100\%-69,57\%=30,43\%\)
\(\%V_{CH_4}=\dfrac{0,1}{0,125}\cdot100\%=80\%\)
\(\%V_{C_2H_4}=100\%-80\%=20\%\)
c)\(C_2H_4+2O_2\underrightarrow{t^o}2CO_2+2H_2O\)
0,025 0,05
\(CH_4+2O_2\underrightarrow{t^o}CO_2+2H_2O\)
0,1 0,2
\(\Rightarrow\Sigma n_{O_2}=0,05+0,2=0,25mol\)
\(\Rightarrow V_{O_2}=0,25\cdot22,4=5,6l\Rightarrow V_{kk}=5V_{O_2}=28l\)
a, \(C_2H_4+Br_2\rightarrow C_2H_4Br_2\)
\(C_2H_2+2Br_2\rightarrow C_2H_2Br_4\)
Ta có: \(n_{C_2H_4}+n_{C_2H_2}=\dfrac{5,6}{22,4}=0,25\left(mol\right)\left(1\right)\)
Theo PT: \(n_{Br_2}=n_{C_2H_4}+2n_{C_2H_2}=\dfrac{48}{160}=0,3\left(mol\right)\left(2\right)\)
Từ (1) và (2) \(\Rightarrow\left\{{}\begin{matrix}x=0,2\left(mol\right)\\y=0,05\left(mol\right)\end{matrix}\right.\)
\(\Rightarrow\left\{{}\begin{matrix}\%V_{C_2H_4}=\dfrac{0,2.22,4}{5,6}.100\%=80\%\\\%V_{C_2H_2}=20\%\end{matrix}\right.\)
b, \(V_{ddBr_2}=\dfrac{0,3}{0,25}=1,2\left(M\right)\)
\(n_{C_2H_4Br_2}=\dfrac{9,4}{188}=0,05mol\)
\(n_{hh}=\dfrac{5,6}{22,4}=0,25mol\)
\(C_2H_4+Br_2\rightarrow C_2H_4Br_2\)
0,05 0,05 0,05 ( mol )
\(m_{Br_2}=0,05.160=8g\)
\(\left\{{}\begin{matrix}\%V_{C_2H_4}=\dfrac{0,05}{0,25}.100=20\%\\\%V_{CH_4}=100\%-20\%=80\%\end{matrix}\right.\)
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: \(n_{C_2H_4}=n_{C_2H_4Br_2}=0,05\left(mol\right)\)
\(\Rightarrow\%V_{C_2H_4}=\dfrac{0,05.22,4}{1,4}.100\%=80\%\)
\(\Rightarrow\%V_{CH_4}=100-80=20\%\)
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
\(n_{C_2H_4Br_2}=\dfrac{1,7}{188}=\dfrac{17}{1880}\left(mol\right)\\C_2H_4+Br_2\rightarrow C_2H_4Br_2 \\ \Rightarrow n_{C_2H_4}=n_{C_2H_4Br_2}=n_{Br_2}=\dfrac{17}{1880}\left(mol\right)\\ a,m_{Br_2}=\dfrac{17}{1880}.160=\dfrac{68}{47}\left(g\right)\\ b,\%V_{C_2H_4}=\dfrac{\dfrac{17}{1880}.22,4}{3}.100\approx6,752\%\Rightarrow\%V_{CH_4}\approx93,248\%\)
a)C2H4 + Br2 -> C2H4Br2
nC2H4Br2 = 1,7/ 188= 0,009(mol)
→ nBr2 =0,009 (mol)
→ mBr2= 1,44 g nhé