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a, PT: \(C_2H_4+Br_2\rightarrow C_2H_4Br_2\)
Khí thoát ra khỏi bình là CH4 (metan).
b, Ta có: \(\left\{{}\begin{matrix}\%V_{CH_4}=\dfrac{1,12}{5,6}.100\%=20\%\\\%V_{C_2H_4}=100-20=80\%\end{matrix}\right.\)
c, Ta có: \(V_{C_2H_4}=5,6.80\%=4,48\left(l\right)\)
\(\Rightarrow n_{C_2H_4}=\dfrac{4,48}{22,4}=0,2\left(mol\right)\)
Theo PT: \(n_{Br_2}=n_{C_2H_4}=0,2\left(mol\right)\)
\(\Rightarrow m_{Br_2}=0,2.160=32\left(g\right)\)
Bạn tham khảo nhé!
a)
\(C_2H_4 + Br_2 \to C_2H_4Br_2\\ CH_4 + 2O_2 \xrightarrow{t^o} CO_2 + 2H_2O\\ CO_2 + Ca(OH)_2 \to CaCO_3 + H_2O\)
b)
\(n_{CH_4} = n_{CO_2} = n_{CaCO_3} = \dfrac{20}{100} = 0,2(mol)\\ \%V_{CH_4} = \dfrac{0,2.22,4}{6,72}.100\% = 66,67\%\\ \%V_{C_2H_4} = 100\% -66,67\% = 33,33\%\)
PT: \(C_2H_4+Br_2\rightarrow C_2H_4Br_2\)
Ta có: \(n_{Br_2}=\dfrac{16}{160}=0,1\left(mol\right)\)
Theo PT: \(n_{C_2H_4}=n_{Br_2}=0,1\left(mol\right)\Rightarrow V_{C_2H_4}=0,1.22,4=2,24\left(l\right)\)
\(\Rightarrow V_{CH_4}=6,72-2,24=4,48\left(l\right)\)
1. \(n_{Br_2}=0,4.0,5=0,2\left(mol\right)\)
PT: \(C_2H_4+Br_2\rightarrow C_2H_4Br_2\)
Theo PT: \(n_{C_2H_4}=n_{Br_2}=0,2\left(mol\right)\Rightarrow V_{C_2H_4}=0,2.22,4=4,48\left(l\right)\)
2. \(n_{C_2H_4Br_2}=\dfrac{9,4}{188}=0,05\left(mol\right)\)
PT: \(C_2H_4+Br_2\rightarrow C_2H_4Br_2\)
Theo PT: \(n_{C_2H_4}=n_{C_2H_4Br_2}=0,05\left(mol\right)\)
\(\Rightarrow\%V_{C_2H_4}=\dfrac{0,05.22,4}{1,4}.100\%=80\%\)
\(\Rightarrow\%V_{CH_4}=100-80=20\%\)
\(n_{hhkhí\left(C_2H_4,CH_4\right)}=\dfrac{7,84}{22,4}=0,35\left(mol\right)\)
\(m_{tăng}=m_{C_2H_4}=4,2\left(g\right)\\ n_{C_2H_4}=\dfrac{4,2}{28}=0,15\left(mol\right)\\ \%V_{C_2H_4}=\dfrac{0,15}{0,35}=42,85\%\\ \%V_{CH_4}=100\%-42,85\%=57,15\%\)
\(n_{Br_2}=\dfrac{4}{160}=0,025\left(mol\right);n_{hh}=\dfrac{2,8}{22,4}=0,125\left(mol\right)\)
PTHH: \(C_2H_4+Br_2\rightarrow C_2H_4Br_2\)
0,025<-0,125
\(\Rightarrow\left\{{}\begin{matrix}\%V_{C_2H_4}=\dfrac{0,025}{0,125}.100\%=20\%\\\%V_{CH_4}=100\%-20\%=80\%\end{matrix}\right.\)
a)
CH4 + 2O2 --to--> CO2 + 2H2O
C2H4 + 3O2 --to--> 2CO2 + 2H2O
b) Gọi số mol CH4, C2H4 là a, b (mol)
=> \(a+b=\dfrac{6,72}{22,4}=0,3\)
\(n_{CaCO_3}=\dfrac{20}{100}=0,2\left(mol\right)\)
Khí thoát ra khỏi bình là CH4
PTHH: CH4 + 2O2 --to--> CO2 + 2H2O
a---------------->a
Ca(OH)2 + CO2 --> CaCO3 + H2O
0,2<------0,2
=> a = 0,2 (mol)
=> \(\left\{{}\begin{matrix}\%V_{CH_4}=\dfrac{0,2}{0,3}.100\%=66,67\%\\\%V_{C_2H_4}=100\%-66,67\%=33,33\%\end{matrix}\right.\)
c) b = 0,1 (mol)
CH4 + 2O2 --to--> CO2 + 2H2O
0,2--------------->0,2----->0,4
C2H4 + 3O2 --to--> 2CO2 + 2H2O
0,1----------------->0,2---->0,2
Ca(OH)2 + CO2 --> CaCO3 + H2O
0,4------>0,4
=> \(m_{CaCO_3}=0,4.100=40\left(g\right)\)
\(\left\{{}\begin{matrix}m_{CO_2}=44\left(0,2+0,2\right)=17,6\left(g\right)\\m_{H_2O}=\left(0,4+0,2\right).18=10,8\left(g\right)\end{matrix}\right.\)
Xét \(\Delta m=m_{CO_2}+m_{H_2O}-m_{CaCO_3}=17,6+10,8-40=-11,6\left(g\right)\)
=> Khối lượng dd giảm 11,6 gam
a) nC2H4Br2=47/188=0,25(mol)
n(CH4,C2H4)=11,2/22,4=0,5(mol)
PTHH: C2H4 + Br2 -> C2H4Br2
0,25<----------0,25<---------0,25(mol)
mBr2(p.ứ)=0,25 x 160= 40(g)
b) V(C2H4,đktc)=0,25 x 22,4= 5,6(l)
=> %V(C2H4)=(5,6/11,2).100=50%
=>%V(CH4)=100% - 50%= 50%
\(n_{hh}=\dfrac{6,72}{22,4}=0,3mol\)
\(n_{C_2H_4Br_2}=\dfrac{16}{188}=\dfrac{4}{47}mol\)
\(\Rightarrow n_{etilen}=\dfrac{4}{47}mol\)
\(\Rightarrow n_{metan}=0,3-\dfrac{4}{47}=\dfrac{101}{470}mol\)
\(C_2H_4+Br_2\rightarrow C_2H_4Br_2\)
\(\%V_{etilen}=\dfrac{\dfrac{4}{47}}{0,3}\cdot100\%=28,37\%\)
\(\%V_{metan}=100\%-28,37\%=71,63\%\)
B
b