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a, \(C_2H_4+Br_2\rightarrow C_2H_4Br_2\)
b, \(n_{Br_2}=\dfrac{16}{160}=0,1\left(mol\right)\)
\(n_{C_2H_4}=n_{Br_2}=0,1\left(mol\right)\)
\(\Rightarrow\left\{{}\begin{matrix}\%V_{C_2H_4}=\dfrac{0,1.22,4}{3,36}.100\%\approx66,67\%\\\%V_{CH_4}\approx33,33\%\end{matrix}\right.\)
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) \(m=m_{C_2H_4}=0,05.28=1,4\left(g\right)\)
Ta có: m dd Br2 tăng = mC2H4 = 2,8 (g)
\(\Rightarrow n_{C_2H_4}=\dfrac{2,8}{28}=0,1\left(mol\right)\)
\(\Rightarrow\left\{{}\begin{matrix}\%V_{C_2H_4}=\dfrac{0,1.22,4}{3,36}.100\%\approx66,67\%\\\%V_{CH_4}\approx33,33\%\end{matrix}\right.\)
Có: \(n_{CH_4}=\dfrac{3,36}{22,4}-0,1=0,05\left(mol\right)\)
⇒ m hh = mCH4 + mC2H4 = 0,05.16 + 0,1.28 = 3,6 (g)
\(\Rightarrow\left\{{}\begin{matrix}\%m_{CH_4}=\dfrac{0,05.16}{3,6}.100\%\approx22,22\%\\\%m_{C_2H_4}\approx77,78\%\end{matrix}\right.\)
PTHH: \(C_2H_4+Br_2\rightarrow C_2H_4Br_2\)
Ta có: \(\left\{{}\begin{matrix}n_{hhkhí}=\dfrac{4,48}{22,4}=0,2\left(mol\right)\\n_{C_2H_4Br_2}=\dfrac{18,8}{188}=0,1\left(mol\right)\end{matrix}\right.\)
\(\Rightarrow n_{C_2H_4}=n_{CH_4}=n_{Br_2}=0,1\left(mol\right)\)
\(\Rightarrow\left\{{}\begin{matrix}V_{CH_4}=V_{C_2H_4}=0,1\cdot22,4=2,24\left(l\right)\\m_{Br_2}=0,1\cdot160=16\left(g\right)\end{matrix}\right.\)
PT: \(C_2H_4+Br_2\rightarrow C_2H_4Br_2\)
a, Ta có: \(n_{hhk}=\dfrac{4,48}{22,4}=0,2\left(mol\right)\)
\(n_{C_2H_4Br_2}=\dfrac{18,8}{188}=0,1\left(mol\right)\)
Theo PT: \(n_{C_2H_4}=n_{C_2H_4Br_2}=0,1\left(mol\right)\)
\(\Rightarrow\left\{{}\begin{matrix}\%V_{C_2H_4}=\dfrac{0,1}{0,2}.100\%=50\%\\\%V_{CH_4}=50\%\end{matrix}\right.\)
b, Theo PT: \(n_{Br_2}=n_{C_2H_4Br_2}=0,1\left(mol\right)\)
\(\Rightarrow m_{Br_2}=0,1.160=16\left(g\right)\)
Bạn tham khảo nhé!
a)
Khí còn lại là CH4
\(n_{CH_4}=\dfrac{0,448}{22,4}=0,02\left(mol\right)\)
=> \(n_{C_2H_4}=\dfrac{1,16-0,02.16}{28}=0,03\left(mol\right)\)
\(\%V_{CH_4}=\dfrac{0,02}{0,02+0,03}.100\%=40\%\)
\(\%V_{C_2H_4}=\dfrac{0,03}{0,02+0,03}.100\%=60\%\)
b)
PTHH: CH4 + 2O2 --to--> CO2 + 2H2O
0,02-------------->0,02
C2H4 + 3O2 --to--> 2CO2 + 2H2O
0,03------------->0,06
=> nCO2 = 0,02 + 0,06 = 0,08 (mol)
PTHH: Ca(OH)2 + CO2 --> CaCO3 + H2O
0,08----->0,08
=> mCaCO3 = 0,08.100 = 8 (g)
ta có :
nBr2=\(\dfrac{16}{160}=0,1mol\)
C2H4+Br2->C2H4Br2
0,1------0,1
=>VC2H4=0,1.22,4=2,24l
=>VCH4=3,36l->n CH4=0,15 mol
->%VC2H4=\(\dfrac{2,24}{5,6}.100\)=40%
=>%VCH4=60%
c)
CH4+2O2-to>CO2+2H2O
0,15---------------0,15
C2H4+3O2--to>2CO2+2H2O
0,1--------------------0,2
=>m CaCO3=0,35.100=35g
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, \(V_{ddBr_2}=\dfrac{0,3}{0,25}=1,2\left(M\right)\)
\(a)n_{C_2H_4Br_2}=\dfrac{37,6}{188}=0,2mol\\ C_2H_4+Br_2\rightarrow C_2H_4Br_2\\ n_{Br_2}=n_{C_2H_4}=n_{C_2H_4Br_2}=0,2mol\\ m_{Br_2}=0,2.160=32g\\ b)\%m_{C_2H_4}=\dfrac{0,2.28}{17,6}\cdot100\%=31,82\%\\ \%m_{CH_4}=100\%-31,82\%=68,18\%\)