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Bài 1:
\(n_{Br_2}=\dfrac{8}{160}=0,05\left(mol\right)\)
PT: \(C_2H_4+Br_2\rightarrow C_2H_4Br_2\)
Theo PT: \(n_{C_2H_4}=n_{Br_2}=0,05\left(mol\right)\)
\(\Rightarrow V_{C_2H_4}=0,05.22,4=1,12\left(l\right)\)
\(\Rightarrow V_{CH_4}=3,36-1,12=2,24\left(l\right)\)
Bài 2:
Ta có: \(n_{C_2H_2}+n_{C_2H_4}=\dfrac{5,6}{22,4}=0,25\left(mol\right)\left(1\right)\)
m dd tăng = mC2H2 + mC2H4
\(\Rightarrow6,8=26n_{C_2H_2}+28n_{C_2H_4}\left(2\right)\)
Từ (1) và (2) \(\Rightarrow\left\{{}\begin{matrix}n_{C_2H_2}=0,1\left(mol\right)\\n_{C_2H_4}=0,15\left(mol\right)\end{matrix}\right.\)
\(\Rightarrow\left\{{}\begin{matrix}V_{C_2H_2}=0,1.22,4=2,24\left(l\right)\\V_{C_2H_4}=0,15.22,4=3,36\left(l\right)\end{matrix}\right.\)
\(C_2H_4 + Br_2 \to C_2H_4Br_2\\ n_{C_2H_4} = n_{Br_2} = \dfrac{4}{160}=0,025(mol)\\ \%V_{C_2H_4} = \dfrac{0,025.22,4}{5,6}.100\% = 10\%\\ \%V_{CH_4}= 100\%-10\%=90\%\)
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) \(\left\{{}\begin{matrix}\%V_{C_2H_4}=\dfrac{1,12}{4,48}.100\%=25\%\\\%V_{CH_4}=\dfrac{3,36}{4,48}.100\%=75\%\end{matrix}\right.\)
\(n_{O_2}=\dfrac{6,72}{22,4}=0,3mol\)
Gọi \(\left\{{}\begin{matrix}n_{CH_4}=x\\n_{C_2H_4}=y\end{matrix}\right.\)
\(CH_4+2O_2\rightarrow\left(t^o\right)CO_2+2H_2O\)
x 2x ( mol )
\(C_2H_4+3O_2\rightarrow\left(t^o\right)2CO_2+2H_2O\)
y 3y ( mol )
Ta có:
\(\left\{{}\begin{matrix}16x+28y=2,6\\2x+3y=0,3\end{matrix}\right.\) \(\Leftrightarrow\left\{{}\begin{matrix}x=0,075\\y=0,05\end{matrix}\right.\)
\(\Rightarrow m_{CH_4}=0,075.16=1,2g\)
\(\Rightarrow m_{C_2H_4}=0,05.28=1,4g\)
\(\%m_{CH_4}=\dfrac{1,2}{2,6}.100=46,15\%\)
\(\%m_{C_2H_4}=100\%-46,15\%=53,85\%\)
\(n_{CH_4}=22,4.0,075=1,68l\)
\(n_{C_2H_4}=0,05.22,4=1,12l\)
\(m_{Br_2}=80g\Rightarrow n_{Br_2}=0,5mol\)
\(C_2H_4+Br_2\rightarrow C_2H_4Br_2\)
0,5 0,5
\(n_{hh}=\dfrac{28}{22,4}=1,25mol\)
\(\Rightarrow n_{CH_4}=1,25-0,5=0,75mol\)
\(\%V_{CH_4}=\dfrac{0,75}{1,25}\cdot100\%=60\%\)
\(\%V_{C_2H_4}=100\%-60\%=40\%\)
\(n_{Br_2}=\dfrac{m_{Br_2}}{M_{Br_2}}=\dfrac{16}{160}=0,1mol\)
\(C_2H_4+Br_2\rightarrow C_2H_4Br_2\)
0,1 0,1 ( mol )
\(\%V_{C_2H_4}=\dfrac{0,1.22,4}{16,8}.100=13,33\%\)
\(\%V_{CH_4}=100\%-13,33\%=86,67\%\)
nhh khí = 2,24/22,4 = 0,1 (mol)
nBr2 = 8/160 = 0,05 (mol)
PTHH: C2H2 + 2Br2 -> C2H2Br4
Mol: 0,025 <--- 0,05
%VC2H2 = 0,025/0,1 = 25%
%VCH4 = 100% - 25% = 75%
Tính % thể tích các khí :
% V C 2 H 2 = 0,448/0,896 x 100% = 50%
% V CH 4 = % V C 2 H 6 = 25%
\(a)n_{Br_2} =\dfrac{16}{160} = 0,1(mol) C_2H_2 +2Br_2 \to C_2H_2Br_4\\ n_{C_2H_2} = \dfrac{1}{2}n_{Br_2} = 0,05(mol)\\ V_{C_2H_2} = 0,05.22,4 = 1,12(lít)\\ V_{CH_4} = 6,72 -1,12 = 5,6(lít)\\ b)\%V_{C_2H_2} = \dfrac{1,12}{6,72}.100\% = 16,67\%\\ \%V_{CH_4} = 100\%-16,67\% = 83,33\%\)
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