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\(n_{Br_2}=\dfrac{16}{160}=0,1mol\Rightarrow n_{CH_2}=0,1mol\)
\(n_{hh}=\dfrac{5,6}{22,4}=0,25mol\)
\(\Rightarrow n_{CH_4}=0,25-0,1=0,15mol\)
\(\%V_{CH_2}=\dfrac{0,1}{0,25}\cdot100\%=40\%\)
\(\%V_{CH_4}=100\%-40\%=60\%\)
\(CH_4+2O_2\underrightarrow{t^o}CO_2+2H_2O\)
\(CH_2+\dfrac{3}{2}O_2\underrightarrow{t^o}CO_2+H_2O\)
\(\Rightarrow\Sigma n_{CO_2}=0,15+0,1=0,25mol\)
\(BTC:n_{CO_2}=n_{CaCO_3}=0,25mol\)
\(\Rightarrow m_{\downarrow}=0,25\cdot100=25g\)
Gọi nCH4 = a mol ; nC2H6 = b mol
có n hỗn hợp khí = \(\dfrac{10,08}{22,4}\) =0,45 mol ; nCO2 = \(\dfrac{14,56}{22,4}\) =0,65 mol
⇒ a + b = 0,45 (1)
BTNT với C , ta có nCO2 = nCH4 + 2nC2H6 ⇔ a +2b = 0,65 (2)
Từ (1) và (2) suy ra a= 0,25 ;b=0,2
⇒%VCH4 = \(\dfrac{0,25}{0,45}\) .100% =55,56% ; %VC2H6 = 44,44%
b)
CO2 + Ba(OH)2 ----> BaCO3 + H2O
0,65 0,65 (mol)
⇒ a = 0,65.197 =128,05 gam
\(a)\\ CH_4 + 2O_2 \xrightarrow{t^o} CO_2 + 2H_2O\\ 2C_2H_2 + 5O_2 \xrightarrow{t^o} 4CO_2 + 2H_2O\\ CO_2 + Ca(OH)_2 \to CaCO_3 + H_2O\\ C_2H_2 + 2Br_2 \to C_2H_2Br_4\\ b) n_{Br_2} = \dfrac{8}{160}=0,05(mol)\\ \Rightarrow n_{C_2H_2}= \dfrac{1}{2}n_{Br_2}= 0,025(mol)\\ n_{CO_2} = n_{CH_4} + 2n_{C_2H_2} = n_{CaCO_3} = \dfrac{50}{100} = 0,5(mol)\\ \Rightarrow n_{CH_4} = 0,5 - 0,025.2 = 0,45(mol)\\ \Rightarrow m = 0,45.16 + 0,05.26 = 8,5(gam)\)
\(\%m_{CH_4} = \dfrac{0,45.16}{8,5}.100\% = 84,7\%\\ \%m_{C_2H_2} = 100\% - 84,7\% = 15,3\%\)
tỉ khối là 13 chứ
nX = 0,25
n↓ = nAnkin = 0,25.20% = 0,05
=>M↓ = 147: C3H3Ag
->Ankin là C3H4 (0,05 mol)
nY = 0,2; nCO2 = 0,3
=>Số C = nCO2/nY = 1,5
Ankan là CH4
mY = mX – mC3H4 = 4,5
=>nH2O = \(\dfrac{4,5}{0,3.12}.\dfrac{1}{2}\) = 0,45
nCH4 = nH2O – nCO2 = 0,15 và nCxH2x = nY – nCH4 = 0,05
nCO2 = 0,15.1 + 0,05x = 0,3
=>x = 3
=> Anken là C3H6
a, \(n_{C_2H_4}=\dfrac{1,12}{22,4}=0,05\left(mol\right)\)
PT: \(C_2H_4+3O_2\underrightarrow{t^o}2CO_2+2H_2O\)
\(CO_2+Ca\left(OH\right)_2\rightarrow CaCO_{3\downarrow}+H_2O\)
Theo PT: \(n_{CaCO_3}=n_{CO_2}=2n_{C_2H_4}=0,1\left(mol\right)\)
\(\Rightarrow m_{CaCO_3}=0,1.100=10\left(g\right)\)
b, Theo PT: \(n_{O_2}=3n_{C_2H_4}=0,15\left(mol\right)\Rightarrow V_{O_2}=0,15.22,4=3,36\left(l\right)\)
\(\Rightarrow V_{kk}=\dfrac{V_{O_2}}{20\%}=16,8\left(l\right)\)
\(n_{hhkhí}=\dfrac{2,8}{22,4}=0,125\left(mol\right)\\ n_{O_2}=\dfrac{6,72}{22,4}=0,3\left(mol\right)\\ Gọi\left\{{}\begin{matrix}n_{CH_4}=a\left(mol\right)\\n_{C_2H_2}=b\left(mol\right)\end{matrix}\right.\)
PTHH:
CH4 + 2O2 \(\underrightarrow{t^o}\) CO2 + 2H2O
a 2a a
2C2H2 + 5O2 \(\underrightarrow{t^o}\) 4CO2 + 2H2O
b 2,5b 2b
Hệ phương trình: \(\left\{{}\begin{matrix}a+b=0,125\\2a+2,5b=0,3\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}a=0,025\left(mol\right)\\b=0,1\left(mol\right)\end{matrix}\right.\)
\(\%V_{C_2H_2}=\dfrac{0,1}{0,125}=80\%\\ \%_{CH_4}=100\%-80\%=20\%\)
nCO2 = 2.0,025 + 2.0,1 = 0,25 (mol)
PTHH: Ca(OH)2 + CO2 -> CaCO3 + H2O
0,25 0,25
=> mCaCO3 = 0,25.100 = 25 (g)
a, Ta có \(n_{CH_4}+n_{C_2H_4}=\dfrac{3,36}{22,4}=0,15\left(mol\right)\left(1\right)\)
PT: \(CH_4+2O_2\underrightarrow{t^o}CO_2+2H_2O\)
\(C_2H_4+3O_2\underrightarrow{t^o}2CO_2+2H_2O\)
Theo PT: \(n_{O_2}=2n_{CH_4}+3n_{C_2H_4}=\dfrac{8,96}{22,4}=0,4\left(mol\right)\left(2\right)\)
Từ (1) và (2) \(\Rightarrow\left\{{}\begin{matrix}n_{CH_4}=0,05\left(mol\right)\\n_{C_2H_4}=0,1\left(mol\right)\end{matrix}\right.\)
\(\Rightarrow\left\{{}\begin{matrix}V_{CH_4}=0,05.22,4=1,12\left(l\right)\\V_{C_2H_4}=0,1.22,4=2,24\left(l\right)\end{matrix}\right.\)
b, \(m_{CH_4}=0,05.16=0,8\left(g\right)\)
c, \(C_2H_4+Br_2\rightarrow C_2H_4Br_2\)
Theo PT: \(n_{Br_2}=n_{C_2H_4}=0,1\left(mol\right)\Rightarrow V_{ddBr_2}=\dfrac{0,1}{1}=0,1\left(l\right)\)
\(m_{C_2H_4}=0,1.28=2,8\left(g\right)\)
nhh khí = 5,6/22,4 = 0,25 (mol)
nBr2 = 16/160 = 0,1 (mol)
PTHH: C2H2 + 2Br2 -> C2H2Br4
Mol: 0,05 <--- 0,1
nCH4 = 0,25 - 0,05 = 0,2 (mol)
%VC2H2 = 0,05/0,25 = 20%
%VCH4 = 100% - 20% = 80%
PTHH:
2C2H2 + 5O2 -> (t°) 4CO2 + 2H2O
0,05 ---> 0,125 ---> 0,1
CH4 + 2O2 -> (t°) CO2 + 2H2O
0,2 ---> 0,4 ---> 0,2
nCO2 = 0,2 + 0,1 = 0,3 (mol)
PTHH: Ca(OH)2 + CO2 -> CaCO3 + H2O
nCaCO3 = 0,3 (mol)
mCaCO3 = 0,3 . 100 = 30 (g)
sao anh gọi em là xoá bỏ :))