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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) \(m=m_{C_2H_4}=0,05.28=1,4\left(g\right)\)
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, \(V_{ddBr_2}=\dfrac{0,3}{0,25}=1,2\left(M\right)\)
a)
\(C_2H_2+2Br_2\rightarrow C_2H_2Br_4\)
\(C_2H_4+Br_2\rightarrow C_2H_4Br_2\)
b)
Gọi số mol C2H2, C2H4 là a, b
=> \(a+b=\dfrac{2,24}{22,4}=0,1\left(mol\right)\)
\(n_{Br_2}=\dfrac{22,4}{160}=0,14\left(mol\right)\)
PTHH:\(C_2H_2+2Br_2\rightarrow C_2H_2Br_4\)
a---->2a
\(C_2H_4+Br_2\rightarrow C_2H_4Br_2\)
b--->b
=> 2a + b = 0,14
=> a = 0,04; b = 0,06
\(\left\{{}\begin{matrix}\%V_{C_2H_2}=\dfrac{0,04}{0,1}.100\%=40\%\\\%V_{C_2H_4}=\dfrac{0,06}{0,1}.100\%=60\%\end{matrix}\right.\)
a)
PTHH: C2H2 + 2Br2 --> C2H2Br4
Khí thoát ra là CH4
\(n_{CH_4}=\dfrac{4,48}{22,4}=0,2\left(mol\right)\)
\(n_{C_2H_2}=\dfrac{6,72}{22,4}-0,2=0,1\left(mol\right)\)
\(\left\{{}\begin{matrix}\%m_{CH_4}=\dfrac{0,2.16}{0,2.16+0,1.26}.100\%=55,17\%\\\%m_{C_2H_2}=\dfrac{0,1.26}{0,2.16+0,1.26}.100\%=44,83\%\end{matrix}\right.\)
b)
PTHH: C2H2 + 2Br2 --> C2H2Br4
0,1--->0,2
=> mBr2 = 0,2.160 = 32 (g)
a)
\(n_{Br_2}=\dfrac{8}{160}=0,05\left(mol\right)\)
PTHH: C2H4 + Br2 --> C2H4Br2
0,05<--0,05
=> \(V_{C_2H_4}=0,05.22,4=1,12\left(l\right)\)
=> \(V_{CH_4}=4,48-1,12=3,36\left(l\right)\)
b) \(\left\{{}\begin{matrix}\%V_{C_2H_4}=\dfrac{1,12}{4,48}.100\%=25\%\\\%V_{CH_4}=\dfrac{3,36}{4,48}.100\%=75\%\end{matrix}\right.\)
Gọi x,y lần lượt là số mol của C2H4, C2H2
Pt: C2H4 + Br2 --> C2H4Br2
.........x----> x
......C2H2 + 2Br2 --> C2H2Br4
.........y-----> 2y
Ta có hpt: \(\left\{{}\begin{matrix}x+y=\frac{4,48}{22,4}\\x+2y=\frac{48}{160}\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}x=0,1\\y=0,1\end{matrix}\right.\)
=> %, m