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a) C2H4 + Br2 --> C2H4Br2
b) \(n_{Br_2}=\dfrac{24}{160}=0,15\left(mol\right)\)
PTHH: C2H4 + Br2 --> C2H4Br2
0,15<--0,15----->0,15
=> \(\%V_{C_2H_4}=\dfrac{0,15.22,4}{7,84}.100\%=42,857\%\)
=> \(\%V_{CH_4}=\dfrac{7,84-0,15.22,4}{7,84}.100\%=57,143\%\)
c) mC2H4Br2 = 0,15.188 = 28,2 (g)
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) \(\left\{{}\begin{matrix}\%V_{C_2H_2}=\dfrac{\dfrac{2016}{65}}{\dfrac{2016}{65}+8,4}.100\%=78,69\%\\\%V_{CH_4}=\dfrac{8,4}{\dfrac{2016}{65}+8,4}.100\%=21,31\%\end{matrix}\right.\)
a) C2H4 + Br2 --> C2H4Br2
C2H2 + 2Br2 --> C2H2Br4
b) Gọi số mol C2H4, C2H2 là a, b (mol)
=> a + b = \(\dfrac{1,68}{22,4}=0,075\left(mol\right)\) (1)
\(n_{Br_2}=\dfrac{16}{160}=0,1\left(mol\right)\)
=> a + 2b = 0,1 (2)
(1)(2) => a = 0,05 (mol); b = 0,025 (mol)
=> \(\left\{{}\begin{matrix}\%V_{C_2H_4}=\dfrac{0,05}{0,075}.100\%=66,67\%\\\%V_{C_2H_2}=\dfrac{0,025}{0,075}.100\%=33,33\%\end{matrix}\right.\)
c)
PTHH: C2H4 + 3O2 --to--> 2CO2 + 2H2O
0,05--->0,15
2C2H2 + 5O2 --to--> 4CO2 + 2H2O
0,025-->0,0625
=> VO2 = (0,15 + 0,0625).22,4 = 4,76 (l)
a.b.\(n_{Br_2}=\dfrac{16}{160}=0,1mol\)
\(n_{hh}=\dfrac{1,68}{22,4}=0,075mol\)
Gọi \(\left\{{}\begin{matrix}n_{C_2H_2}=x\\n_{C_2H_4}=y\end{matrix}\right.\)
\(C_2H_2+2Br_2\rightarrow C_2H_2Br_4\)
x 2x ( mol )
\(C_2H_4+Br_2\rightarrow C_2H_4Br_2\)
y y ( mol )
Ta có:
\(\left\{{}\begin{matrix}22,4x+22,4y=1,68\\2x+y=0,1\end{matrix}\right.\) \(\Leftrightarrow\left\{{}\begin{matrix}x=0,025\\y=0,05\end{matrix}\right.\)
\(\%V_{C_2H_2}=\dfrac{0,025}{0,075}.100=33,33\%\)
\(\%V_{C_2H_4}=100\%-33,33\%=66,67\%\)
c.
\(2C_2H_2+5O_2\rightarrow\left(t^o\right)4CO_2+2H_2O\)
0,025 0,0625 ( mol )
\(C_2H_4+3O_2\rightarrow\left(t^o\right)2CO_2+2H_2O\)
0,05 0,15 ( mol )
\(V_{O_2}=\left(0,0625+0,15\right).22,4=4,76l\)
\(n_{Br_2}=\dfrac{m_{Br_2}}{M_{Br_2}}=\dfrac{16}{160}=0,1mol\)
\(C_2H_4+Br_2\rightarrow C_2H_4Br_2\)
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, \(C_2H_2+2Br_2\rightarrow C_2H_2Br_4\)
b, - Khí thoát ra là CH4 ⇒ VCH4 = 6,72 (l)
\(\Rightarrow\left\{{}\begin{matrix}\%V_{CH_4}=\dfrac{6,72}{13,44}.100\%=50\%\\\%V_{C_2H_2}=50\%\end{matrix}\right.\)
a. PTHH: \(C_2H_2+2Br_2\rightarrow C_2H_2Br_4\)
a. Vì CH4 không phản ứng với dd Br2 nên
\(V_{CH_4}=6,72\left(l\right)\)
\(\%V_{CH_4}=\dfrac{6,72}{13,44}x100\%=50\%\)
\(\%V_{C_2H_2}=100\%-50\%=50\%\)
a.\(m_{dd.Br_2\left(tăng\right)}=m_{C_2H_2}=2,6g\)
\(n_{hh}=\dfrac{5,6}{22,4}=0,25mol\)
\(n_{C_2H_2}=\dfrac{2,6}{26}=0,1mol\)
\(\%V_{C_2H_2}=\dfrac{0,1}{0,25}.100=40\%\)
\(\%V_{CH_4}=100\%-40\%=60\%\)
b.\(C_2H_2+2Br_2\rightarrow C_2H_2Br_4\)
0,1 0,2 ( mol )
\(C_{M\left(dd.Br_2\right)}=\dfrac{0,2}{0,1}=2M\)