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\(n_{hh}=\dfrac{3,36}{22,4}=0,15mol\)
\(n_{Br_2}=\dfrac{2,4}{160}=0,015mol\)
\(C_2H_2+2Br_2\rightarrow C_2H_2Br_4\)
0,0075 0,015 ( mol )
\(V_{C_2H_2}=0,0075.22,4=0,168l\)
\(V_{CH_4}=3,36-0,168=3,192l\)
\(\%V_{C_2H_2}=\dfrac{0,168}{3,36}.100=5\%\)
\(\%V_{CH_4}=100\%-5\%=95\%\)
a) \(C_2H_4 + Br_2 \to C_2H_4Br_2\)
b)
\(n_{C_2H_4} = n_{Br_2} = \dfrac{5,6}{160} = 0,035(mol)\\ \%V_{C_2H_4} = \dfrac{0,035.22,4}{0,86}.100\% = 91,16\%\\ \%V_{CH_4} = 100\% - 91,16\% = 8,84\%\)
nkhí thoát ra(CH4) =0,1 mol
nhh khí bđ=0,15 mol
=>nC2H2=0,05 mol
C2H2 +2Br2 =>C2H2Br4
%V CH4=0,1/0,15.100%=66,67%
%V C2H2=33,33%
Gọi số mol của C2H4 và C2H2 lần lượt là x và y mol
theo bài ra: x+y = 0,56/22,4 = 0,025 (mol)
Pt:
C2H4 + Br2 → C2H4Br2
x mol x mol x mol
C2H2 + 2 Br2 → C2H2Br4
y mol 2y mol y mol
Số mol n Br2 = x+2y = 5,6/160 = 0,035 9mol)
Giải hệ ta đc: x = 0,015 và y = 0,01
=> %V C2H4 = 0,015/0,025 = 60% ; %V C2H2 = 40%
\(n_{hhk}=\dfrac{2,8}{22,4}=0,125\left(mol\right)\)
a, PT: \(C_2H_2+2Br_2\rightarrow C_2H_2Br_4\)
b, Ta có: \(n_{Br_2}=\dfrac{4,8}{160}=0,03\left(mol\right)\)
Theo PT: \(n_{C_2H_2}=\dfrac{1}{2}n_{Br_2}=0,015\left(mol\right)\)
\(\Rightarrow\left\{{}\begin{matrix}\%V_{C_2H_2}=\dfrac{0,015}{0,125}.100\%=12\%\\\%V_{CH_4}=88\%\end{matrix}\right.\)
c, PT: \(CH_4+2O_2\underrightarrow{t^o}CO_2+2H_2O\)
\(2C_2H_2+5O_2\underrightarrow{t^o}4CO_2+2H_2O\)
Ta có: \(n_{CH_4}=0,125-0,015=0,11\left(mol\right)\)
Theo PT: \(n_{O_2}=2n_{CH_4}+\dfrac{5}{2}n_{C_2H_2}=0,2575\left(mol\right)\)
\(\Rightarrow V_{O_2}=0,2575.22,4=5,768\left(l\right)\)
Mà: VO2 = 20% Vkk
\(\Rightarrow V_{kk}=5,768.5=28,84\left(l\right)\)
Bạn tham khảo nhé!
a, \(C_2H_2+2Br_2\rightarrow C_2H_2Br_4\)
\(n_{Br_2}=\dfrac{8}{160}=0,05\left(mol\right)\)
\(n_{C_2H_2}=\dfrac{1}{2}n_{Br_2}=0,025\left(mol\right)\Rightarrow m_{C_2H_2}=0,025.26=0,65\left(g\right)\)
b, \(\left\{{}\begin{matrix}\%V_{C_2H_2}=\dfrac{0,025.22,4}{33,6}.100\%\approx1,67\%\\\%V_{CH_4}\approx98,33\%\end{matrix}\right.\)
a, PT: \(C_2H_2+2Br_2\rightarrow C_2H_2Br_4\)
b, \(n_{Br_2}=\dfrac{5,6}{160}=0,035\left(mol\right)\)
Theo PT: \(n_{C_2H_2}=\dfrac{1}{2}n_{Br_2}=0,0175\left(mol\right)\)
\(\Rightarrow\%V_{C_2H_2}=\dfrac{0,0175.22,4}{0,86}.100\%\approx45,58\%\)
\(\Rightarrow\%V_{CH_4}\approx54,42\%\)
\(n_{C_2H_4Br_2}=\dfrac{9,4}{188}=0,05mol\)
\(n_{hh}=\dfrac{5,6}{22,4}=0,25mol\)
\(C_2H_4+Br_2\rightarrow C_2H_4Br_2\)
0,05 0,05 0,05 ( mol )
\(m_{Br_2}=0,05.160=8g\)
\(\left\{{}\begin{matrix}\%V_{C_2H_4}=\dfrac{0,05}{0,25}.100=20\%\\\%V_{CH_4}=100\%-20\%=80\%\end{matrix}\right.\)
a) PTHH: \(C_2H_2+2Br_2\rightarrow C_2H_2Br_4\)
b) Ta có: \(\%V_{CH_4}=\dfrac{3,36}{8,96}=37,5\%\) \(\Rightarrow\%V_{C_2H_2}=62,5\%\)
c) Theo PTHH: \(n_{Br_2}=2n_{C_2H_2}=2\cdot\dfrac{8,96-3,36}{22,4}=0,5\left(mol\right)\) \(\Rightarrow m_{Br_2}=0,5\cdot160=80\left(g\right)\)