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a, \(n_{C_2H_4}+n_{C_2H_2}=\dfrac{6,72}{22,4}=0,3\left(mol\right)\left(1\right)\)
PT: \(C_2H_4+Br_2\rightarrow C_2H_4Br_2\)
\(C_2H_2+2Br_2\rightarrow C_2H_2Br_4\)
Theo PT: \(n_{Br_2}=n_{C_2H_4}+2n_{C_2H_2}=\dfrac{72}{160}=0,45\left(mol\right)\left(2\right)\)
Từ (1) và (2) \(\Rightarrow\left\{{}\begin{matrix}n_{C_2H_4}=0,15\left(mol\right)\\n_{C_2H_2}=0,15\left(mol\right)\end{matrix}\right.\)
\(\Rightarrow\left\{{}\begin{matrix}\%m_{C_2H_4}=\dfrac{0,15.28}{0,15.28+0,15.26}.100\%\approx51,85\%\\\%m_{C_2H_2}\approx48,15\%\end{matrix}\right.\)
\(\%V_{C_2H_4}=\%V_{C_2H_2}=\dfrac{0,15.22,4}{6,72}.100\%=50\%\)
b, Theo PT: \(\left\{{}\begin{matrix}n_{C_2H_4Br_2}=n_{C_2H_4}=0,15\left(mol\right)\\n_{C_2H_2Br_4}=n_{C_2H_2}=0,15\left(mol\right)\end{matrix}\right.\)
\(\Rightarrow\left\{{}\begin{matrix}m_{C_2H_4Br_2}=0,15.188=28,2\left(g\right)\\m_{C_2H_2Br_4}=0,15.346=51,9\left(g\right)\end{matrix}\right.\)
\(n_{Br_2}=\dfrac{m_{Br_2}}{M_{Br_2}}=\dfrac{56}{160}=0,35mol\)
Gọi \(n_{C_2H_4}\) là x \(\Rightarrow V_{C_2H_4}=22,4x\)
\(n_{C_2H_2}\) là y \(\Rightarrow V_{C_2H_2}=22,4y\)
\(C_2H_4+Br_2\rightarrow C_2H_4Br_2\)
x x ( mol )
\(C_2H_2+2Br_2\rightarrow C_2H_2Br_4\)
y 2y ( mol )
Ta có:
\(\left\{{}\begin{matrix}22,4x+22,4y=5,6\\x+2y=0,35\end{matrix}\right.\) \(\Leftrightarrow\left\{{}\begin{matrix}x=0,15\\y=0,1\end{matrix}\right.\)
\(\Rightarrow V_{C_2H_4}=22,4.0,15=3,36l\)
\(\Rightarrow V_{C_2H_2}=22,4.0,1=2,24l\)
\(\%V_{C_2H_4}=\dfrac{3,36}{5,6}.100=60\%\)
\(\%V_{C_2H_2}=\dfrac{2,24}{5,6}.100=40\%\)
nhh khí = 5,6/22,4 = 0,25 (mol)
Gọi nC2H4 = a (mol); nC2H2 = b (mol)
a + b = 0,25 (1)
nBr2 = 56/160 = 0,35 (mol)
PTHH:
C2H4 + Br2 -> C2H4Br2
Mol: a ---> a
C2H2 + 2Br2 -> C2H2Br4
Mol: b ---> 2b
a + 2b = 0,35 (2)
(1)(2) => a = 0,15 (mol); b = 0,1 (mol)
%VC2H2 = 0,15/0,25 = 60%
%VC2H4 = 100% - 60% = 40%
Ta có: \(n_{Br_2}=\dfrac{1,6}{160}=0,01\left(mol\right)\)
PT: \(C_2H_4+Br_2\rightarrow C_2H_4Br_2\)
Theo PT: \(n_{C_2H_4}=n_{Br_2}=0,01\left(mol\right)\)
\(\Rightarrow\%V_{C_2H_4}=\dfrac{0,01.22,4}{0,5}.100\%=44,8\%\)
\(\Rightarrow\%V_{CH_4}=100-44,8=55,2\%\)
a, Ta có: \(n_{CH_4}+n_{C_2H_4}=\dfrac{3,36}{22,4}=0,15\left(mol\right)\left(1\right)\)
\(16n_{CH_4}+28n_{C_2H_4}=3\left(2\right)\)
Từ (1) và (2) \(\Rightarrow\left\{{}\begin{matrix}n_{CH_4}=0,1\left(mol\right)\\n_{C_2H_4}=0,05\left(mol\right)\end{matrix}\right.\)
\(\Rightarrow\left\{{}\begin{matrix}\%m_{CH_4}=\dfrac{0,1.16}{3}.100\%\approx53,33\%\\\%m_{C_2H_4}\approx46,67\%\end{matrix}\right.\)
- Ở cùng điều kiện nhiệt độ và áp suất, % số mol cũng là %V.
\(\Rightarrow\left\{{}\begin{matrix}\%V_{CH_4}=\dfrac{0,1}{0,15}.100\%\approx66,67\%\\\%V_{C_2H_4}\approx33,33\%\end{matrix}\right.\)
b, PT: \(C_2H_4+Br_2\rightarrow C_2H_4Br_2\)
Có: m tăng = mC2H4 = 0,05.28 = 1,4 (g)
a) \(n_{hh}=\dfrac{3,36}{22,4}=0,15\left(mol\right)\)
Gọi \(\left\{{}\begin{matrix}n_{CH_4}=a\left(mol\right)\\n_{C_2H_4}=b\left(mol\right)\end{matrix}\right.\Rightarrow\left\{{}\begin{matrix}a+b=0,15\\16a+28b=3\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}a=0,1\\b=0,05\end{matrix}\right.\)
\(\Rightarrow\left\{{}\begin{matrix}\%V_{CH_4}=\dfrac{0,1}{0,15}.100\%=66,67\%\\\%V_{C_2H_4}=100\%-66,67\%=33,33\%\end{matrix}\right.\)
\(\Rightarrow\left\{{}\begin{matrix}\%m_{CH_4}=\dfrac{0,1.16}{3}.100\%=53,33\%\\\%m_{C_2H_4}=100\%-53,33\%=46,67\%\end{matrix}\right.\)
b) \(m=m_{C_2H_4}=0,05.28=1,4\left(g\right)\)
48% hay 4,8%
mBr=43,2g
nbr2=0,27mol
vì ch4 k pu vs Br2
pt C2H4+BR2--->C2H4Br2
mc2h4br2=50,76g
%mc2h4=21,7%
%mch4=78,3%