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Ta có: \(n_{C_2H_2Br_2}=\dfrac{173}{186}\left(mol\right)\)
PT: \(C_2H_2+Br_2\rightarrow C_2H_2Br_2\)
Theo PT: \(n_{C_2H_2}=n_{C_2H_2Br_2}=\dfrac{173}{186}\left(mol\right)\)
\(\Rightarrow V_{C_2H_2}=\dfrac{173}{186}.22,4=20,83\left(l\right)\) > Vhh → vô lý
Bạn xem lại đề nhé.
a)
\(n_{Br_2}=\dfrac{8}{160}=0,05\left(mol\right)\)
PTHH: C2H4 + Br2 --> C2H4Br2
0,05<-0,05
=> \(n_{CH_4}=\dfrac{3,36}{22,4}-0,05=0,1\left(mol\right)\)
\(\%m_{CH_4}=\dfrac{0,1.16}{0,1.16+0,05.28}.100\%=53,33\%\)
\(\%m_{C_2H_4}=\dfrac{0,05.28}{0,1.16+0,05.28}.100\%=46,67\%\)
b)
PTHH: CH4 + 2O2 --to--> CO2 + 2H2O
0,1-->0,2
C2H4 + 3O2 --to--> 2CO2 + 2H2O
0,05--->0,15
=> \(V_{O_2}=\left(0,2+0,15\right).22,4=7,84\left(l\right)\)
a)
PTHH: C2H2+2Br2 --> C2H2Br4
b) \(n_{C_2H_2}=\dfrac{36}{26}=\dfrac{18}{13}\left(mol\right)\)
=> \(V_{C_2H_2}=\dfrac{18}{13}.22,4=\dfrac{2016}{65}\left(l\right)\)
\(n_{CH_4}=\dfrac{42-36}{16}=0,375\left(mol\right)\)
=> \(V_{CH_4}=0,375.22,4=8,4\left(l\right)\)
c) \(\left\{{}\begin{matrix}\%V_{C_2H_2}=\dfrac{\dfrac{2016}{65}}{\dfrac{2016}{65}+8,4}.100\%=78,69\%\\\%V_{CH_4}=\dfrac{8,4}{\dfrac{2016}{65}+8,4}.100\%=21,31\%\end{matrix}\right.\)
\(m_{tăng}=m_{C_2H_2}=1,3\left(g\right)\\ \Rightarrow n_{C_2H_2}=\dfrac{1,3}{26}=0,05\left(mol\right)\\ \Rightarrow\%V_{\dfrac{C_2H_2}{A}}=\dfrac{0,05.22,4}{4,48}.100=25\%\\ \Rightarrow\%V_{\dfrac{CH_4}{A}}=100\%-25\%=75\%\)
\(n_{hhkhí\left(C_2H_4,CH_4\right)}=\dfrac{7,84}{22,4}=0,35\left(mol\right)\)
\(m_{tăng}=m_{C_2H_4}=4,2\left(g\right)\\ n_{C_2H_4}=\dfrac{4,2}{28}=0,15\left(mol\right)\\ \%V_{C_2H_4}=\dfrac{0,15}{0,35}=42,85\%\\ \%V_{CH_4}=100\%-42,85\%=57,15\%\)
PTHH: \(CH_4+2O_2\xrightarrow[]{t^o}CO_2+2H_2O\)
Ta có: \(n_{CO_2}=\dfrac{1,68}{22,4}=0,075\left(mol\right)=n_{CH_4}\)
Đặt \(\left\{{}\begin{matrix}n_{C_2H_4}=a\left(mol\right)\\n_{C_2H_2}=b\left(mol\right)\end{matrix}\right.\) \(\Rightarrow a+b=\dfrac{5,04}{22,4}-0,075=0,15\) (1)
PTHH: \(C_2H_4+Br_2\rightarrow C_2H_4Br_2\)
\(C_2H_2+2Br_2\rightarrow C_2H_2Br_4\)
Theo PTHH: \(28a+26b=4,1\) (2)
Từ (1) và (2) \(\Rightarrow\left\{{}\begin{matrix}a=n_{C_2H_4}=0,1\left(mol\right)\\b=n_{C_2H_2}=0,05\left(mol\right)\end{matrix}\right.\)
Mặt khác: \(n_{hh}=\dfrac{5,04}{22,4}=0,225\left(mol\right)\) \(\Rightarrow\left\{{}\begin{matrix}\%V_{CH_4}=\dfrac{0,075}{0,225}\cdot100\%\approx33,33\%\\\%V_{C_2H_4}=\dfrac{0,1}{0,225}\cdot100\%\approx44,44\%\\\%V_{C_2H_2}=22,23\%\end{matrix}\right.\)
\(m_{tăng}=m_{C_2H_2}=0,78\left(g\right)\\PTHH:C_2H_2+2Br_2\rightarrow C_2H_2Br_4\\ n_{C_2H_2}=\dfrac{0,78}{26}=0,03\left(mol\right)\\ n_{hh.khí}=\dfrac{2,24}{22,4}=0,1\left(mol\right)\\\Rightarrow n_{CH_4}=0,1-0,03=0,07\left(mol\right)\\ n.tỉ.lệ.thuận.với.V\\ \%V_{CH_4}=\dfrac{0,07}{0,1}.100\%=70\%;\%V_{C_2H_2}=100\%-70\%=30\%\)