Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
\(n_{Br_2}=\dfrac{2,8}{160}=0,0175\left(mol\right)\\ C_2H_4+Br_2\rightarrow C_2H_4Br_2\\ n_{C_2H_4}=n_{Br_2}=0,0175\left(mol\right)\\ m_{C_2H_4}=28.0,0175=0,49\left(g\right)\\ m_{CH_4}=4,3-0,49=3,81\left(g\right)\\ n_{CH_4}=\dfrac{3,81}{16}=0,238125\left(mol\right)\\ \%V_{C_2H_4}=\dfrac{0,0175}{0,0175+0,238125}.100\%\approx6,846\%\\ \%V_{CH_4}\approx93,154\%\)
Câu c hình như chưa đủ đề em hi
\(m_{Br_2}=80g\Rightarrow n_{Br_2}=0,5mol\)
\(C_2H_4+Br_2\rightarrow C_2H_4Br_2\)
0,5 0,5
\(n_{hh}=\dfrac{28}{22,4}=1,25mol\)
\(\Rightarrow n_{CH_4}=1,25-0,5=0,75mol\)
\(\%V_{CH_4}=\dfrac{0,75}{1,25}\cdot100\%=60\%\)
\(\%V_{C_2H_4}=100\%-60\%=40\%\)
PT: \(C_2H_4+Br_2\rightarrow C_2H_4Br_2\)
Ta có: \(n_{Br_2}=\dfrac{16}{160}=0,1\left(mol\right)\)
Theo PT: \(n_{C_2H_4}=n_{Br_2}=0,1\left(mol\right)\Rightarrow V_{C_2H_4}=0,1.22,4=2,24\left(l\right)\)
\(\Rightarrow V_{CH_4}=6,72-2,24=4,48\left(l\right)\)
C2H4+Br2->C2H4Br2
0,05----0,05
n Br2=\(\dfrac{8}{160}\)=0,05 mol
=>%VC2H4=\(\dfrac{0,05.22,4}{5,6}.100=20\%\)
=>%VCH4=80%
c)CH4+2O2-to>CO2+2H2O
1.10-3----2.10-3 mol
C2H4+3O2-to>2CO2+2H2O
2,5.10-4-7,5.10-4 mol
n hh=\(\dfrac{0,028}{22,4}\)=1,25.10-3 mol
=>n C2H4=2,5.10-4 mol
=>n CH4=1.10-3 mol
=>VO2=(2.10-3+7,5.10-4).22,4=0,0616l
\(n_{Br_2}=\dfrac{8}{160}=0,05mol\)
\(\Rightarrow n_{etilen}=n_{Br_2}=0,05mol\)
\(n_{hh}=\dfrac{5,6}{22,4}=0,25mol\)
\(\Rightarrow n_{metan}=n_{hh}-n_{etilen}=0,25-0,05=0,2mol\)
a)\(C_2H_4+Br_2\rightarrow C_2H_4Br_2\)
b)\(\%V_{metan}=\dfrac{0,2}{0,25}\cdot100\%=80\%\)
\(\%V_{etilen}=100\%-80\%=20\%\)
\(n_{Br_2}=\dfrac{m_{Br_2}}{M_{Br_2}}=\dfrac{16}{160}=0,1mol\)
\(C_2H_4+Br_2\rightarrow C_2H_4Br_2\)
0,1 0,1 ( mol )
\(\%V_{C_2H_4}=\dfrac{0,1.22,4}{16,8}.100=13,33\%\)
\(\%V_{CH_4}=100\%-13,33\%=86,67\%\)
a) \(n_{Br_2\left(p\text{ư}\right)}=\dfrac{6,4}{160}=0,04\left(mol\right);n_{hh}=\dfrac{13,44}{22,4}=0,6\left(mol\right)\)
PTHH: \(C_2H_4+Br_2\rightarrow C_2H_4Br_2\)
0,04<--0,04
\(\Rightarrow\left\{{}\begin{matrix}\%V_{C_2H_4}=\dfrac{0,04}{0,6}.100\%=6,67\%\\\%V_{CH_4}=100\%-6,67\%=93,33\%\end{matrix}\right.\)
b) \(n_{CH_4}=0,6-0,04=0,56\left(mol\right)\)
PTHH: \(CH_4+2O_2\xrightarrow[]{t^o}CO_2+2H_2O\)
0,56----------->0,56
\(C_2H_4+3O_2\xrightarrow[]{t^o}2CO_2+2H_2O\)
0,04----------->0,08
\(\Rightarrow V_{CO_2}=\left(0,08+0,56\right).22,4=14,336\left(l\right)\)
\(n_{Br_2}=\dfrac{1,92}{160}=0,012\left(mol\right)\)
Gọi số mol C2H4, C2H2 là a, b (mol)
=> \(a+b=\dfrac{0,224}{22,4}=0,01\) (1)
PTHH: C2H4 + Br2 --> C2H4Br2
a---->a
C2H2 + 2Br2 --> C2H2Br4
b----->2b
=> a + 2b = 0,012 (2)
(1)(2) => a = 0,008 (mol); b = 0,002 (mol)
=> \(\left\{{}\begin{matrix}\%V_{C_2H_4}=\dfrac{0,008}{0,01}.100\%=80\%\\\%V_{C_2H_2}=100\%-80\%=20\%\end{matrix}\right.\)
a)
C2H4 + Br2 --> C2H4Br2
C2H2 + 2Br2 --> C2H2Br4
b) Gọi số mol C2H4, C2H2 là a, b (mol)
=> \(a+b=\dfrac{11,2}{22,4}=0,5\) (1)
PTHH: C2H4 + Br2 --> C2H4Br2
a---->a
C2H2 + 2Br2 --> C2H2Br4
b---->2b
=> a + 2b = \(\dfrac{112}{160}=0,7\) (2)
(1)(2) => a = 0,3 (mol); b = 0,2 (mol)
\(\left\{{}\begin{matrix}\%V_{C_2H_4}=\dfrac{0,3}{0,5}.100\%=60\%\\\%V_{C_2H_2}=\dfrac{0,2}{0,5}.100\%=40\%\end{matrix}\right.\)
\(\left\{{}\begin{matrix}\%m_{C_2H_4}=\dfrac{0,3.28}{0,3.28+0,2.26}.100\%=61,765\%\\\%m_{C_2H_2}=\dfrac{0,2.26}{0,3.28+0,2.26}.100\%=38,235\%\end{matrix}\right.\)
\(n_{Br_2}=\dfrac{28}{160}=0,175\left(mol\right)\\ a,C_2H_4+Br_2\rightarrow C_2H_4Br_2\\ b,n_{C_2H_4}=n_{Br_2}=0,175\left(mol\right)\\ V_{C_2H_4}=0,175.22,4=3,92\left(l\right)\\ \%V_{C_2H_4}=\dfrac{3,92}{8,6}.100\approx45,581\%\\ \%V_{CH_4}\approx54.419\%\)
c, Thiếu dữ kiện