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a)
\(m_{C_2H_2} = m_{tăng} = 5,2\ gam\\ \Rightarrow n_{C_2H_2} = \dfrac{5,2}{26} = 0,2(mol)\)
Vậy :
\(\%V_{C_2H_2} = \dfrac{0,2.22,4}{8,96}.100\% = 50\%\\ \%V_{CH_4} = 100\%-50\% = 50\%\)
b)
\(n_{CH_4} = n_{C_2H_2} = 0,2(mol)\)
CH4 + O2 \(\xrightarrow{t^o}\) CO2 + H2O
0,2.........................0,2...................................(mol)
C2H2 + \(\dfrac{5}{2}\)O2 \(\xrightarrow{t^o}\) 2CO2 + H2O
0,2................................0,4.................................(mol)
CO2 + Ca(OH)2 → CaCO3 + H2O
(0,2+0,4)............................(0,2+0,4)........................................(mol)
\(\Rightarrow m_{CaCO_3} =(0,2 + 0,4).100 = 60(gam)\)
a, PT: \(C_2H_4+Br_2\rightarrow C_2H_4Br_2\)
b, - Khí thoát ra là CH4.
⇒ VCH4 = 4,48 (l)
\(\Rightarrow\left\{{}\begin{matrix}\%V_{CH_4}=\dfrac{4,48}{11,2}.100\%=40\%\\\%V_{C_2H_4}=100-40=60\%\end{matrix}\right.\)
a.b.\(m_{tăng}=m_{C_2H_4}=2,8g\)
\(n_{C_2H_4}=\dfrac{2,8}{28}=0,1mol\)
\(C_2H_4+Br_2\rightarrow C_2H_4Br_2\)
\(n_{hh}=\dfrac{6,72}{22,4}=0,3mol\)
\(\rightarrow m_{CH_4}=\left(0,3-0,1\right).16=3,2g\)
\(\rightarrow\left\{{}\begin{matrix}\%m_{C_2H_4}=\dfrac{2,8}{2,8+3,2}.100=46,67\%\\\%m_{CH_4}=100\%-46,67\%=53,33\%\end{matrix}\right.\)
c.\(CH_4+2O_2\rightarrow\left(t^o\right)CO_2+2H_2O\)
0,2 0,2 ( mol )
\(C_2H_4+3O_2\rightarrow\left(t^o\right)2CO_2+2H_2O\)
0,1 0,2 ( mol )
\(V_{CO_2}=\left(0,2+0,2\right).22,4=8,96l\)
a, nBr2 = 8/160 = 0,05 (mol)
PTHH: C2H4 + Br2 -> C2H4Br2
Mol: 0,05 <--- 0,05 <--- 0,05
Vhh khí = 2,8/22,4 = 0,125 (mol)
%VC2H4 = 0,05/0,125 = 40%
%CH4 = 100% - 40% = 60%
b, nCH4 = 0,125 - 0,05 = 0,075 (mol)
PTHH: C2H4 + 3O2 -> (t°) 2CO2 + 2H2O
Mol: 0,05 ---> 0,15
CH4 + 2O2 -> (t°) CO2 + 2H2O
Mol: 0,075 ---> 0,15
Vkk = (0,15 + 0,15) . 5 . 22,4 = 33,6 (l)
\(n_{C_2H_4Br_2}=\dfrac{9,4}{188}=0,05mol\)
\(n_{hh}=\dfrac{5,6}{22,4}=0,25mol\)
\(C_2H_4+Br_2\rightarrow C_2H_4Br_2\)
0,05 0,05 0,05 ( mol )
\(m_{Br_2}=0,05.160=8g\)
\(\left\{{}\begin{matrix}\%V_{C_2H_4}=\dfrac{0,05}{0,25}.100=20\%\\\%V_{CH_4}=100\%-20\%=80\%\end{matrix}\right.\)
nBr2 = 32/160 = 0,2 (mol)
PTHH: C2H4 + Br2 -> C2H4Br2
Mol: 0,2 <--- 0,2
nhh khí = 44,8/22,4 = 2 (mol)
%VC2H4 = 0,2/2 = 10%
%VCH4 = 100% - 10% = 90%
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
