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\(CH_4+2O_2\rightarrow\left(t^o\right)CO_2+2H_2O\\ n_{CH_4}=\dfrac{14,874}{22,79}=0,6\left(mol\right)\\ \Rightarrow n_{CO_2}=n_{CH_4}=0,6\left(mol\right)\\ n_{O_2}=n_{H_2O}=2.0,6=1,2\left(mol\right)\\ V_{O_2\left(đkc\right)}=1,2.24,79=29,748\left(l\right)\\ V_{kk\left(đkc\right)}=29,748.5=148,74\left(l\right)\\ V_{CO_2\left(đkc\right)}=0,6.24,79=14,874\left(l\right)\\ m_{CO_2}=44.0,6=26,4\left(g\right)\\ m_{H_2O}=1,2.18=21,6\left(g\right)\\ V_{H_2O}=\dfrac{21,6}{1}=21,6\left(ml\right)\)
Đề cho đkc nên anh tính theo đkc nhé!
\(pthh:CH_4+2O_2\overset{t^o}{--->}CO_2\uparrow+2H_2O\)
Ta có: \(n_{CH_4}=\dfrac{14,874}{22,4}=\dfrac{7437}{11200}\left(mol\right)\)
Theo pt: \(n_{O_2}=n_{H_2O}=2.n_{CH_4}=2.\dfrac{7437}{11200}\approx1,328\left(mol\right)\)
\(\Rightarrow\left\{{}\begin{matrix}V_{O_2}=1,328.22,4=29,7472\left(lít\right)\\m_{H_2O}=1,328.18=23,904\left(g\right)\end{matrix}\right.\)
Theo pt: \(n_{CO_2}=n_{CH_4}=\dfrac{7437}{11200}\left(mol\right)\)
\(\Rightarrow\left\{{}\begin{matrix}V_{CO_2}=\dfrac{7437}{11200}.22,4=14,874\left(lít\right)\\m_{CO_2}=\dfrac{7437}{11200}.44\approx29,22\left(g\right)\end{matrix}\right.\)
\(n_{CH_4}=\dfrac{V}{22,4}=\dfrac{11,2}{22,4}=0,5mol\)
\(CH_4+2O_2\rightarrow\left(t^o\right)CO_2+2H_2O\)
0,5 1 0,5 ( mol )
\(V_{O_2}=n.24,79=1.24,79=24,79l\)
\(V_{CO_2}=n.24,79=0,5.24,79=12,395l\)
nCH4 = 11,2/22,4 = 0,5 (mol)
PTHH: CH4 + 2O2 -> (t°) CO2 + 2H2O
Mol: 0,5 ---> 1
VO2 = 1 . 24,79 = 24,79 (l)
\(Đặt:n_{CH_4}=a\left(mol\right);n_{C_2H_4}=b\left(mol\right)\left(a,b>0\right)\\ PTHH:CH_4+2O_2\rightarrow\left(t^o\right)CO_2+2H_2O\\ C_2H_4+3O_2\rightarrow\left(t^o\right)2CO_2+2H_2O\\ \Rightarrow\left\{{}\begin{matrix}a+b=0,25\\2a+3b=0,625\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}a=0,125\\b=0,125\end{matrix}\right.\\ a,m_{hh}=m_{CH_4}+m_{C_2H_4}=16.0,125+28.0,125=5,5\left(g\right)\\ b,V_{CO_2\left(đktc\right)}=22,4.\left(a+2b\right)=8,4\left(l\right)\)
a, \(CH_4+2O_2\underrightarrow{^{t^o}}CO_2+2H_2O\)
\(C_2H_4+3O_2\underrightarrow{^{t^o}}2CO_2+2H_2O\)
b, Gọi: \(\left\{{}\begin{matrix}n_{CH_4}=x\left(mol\right)\\n_{C_2H_4}=y\left(mol\right)\end{matrix}\right.\) \(\Rightarrow x+y=\dfrac{4,48}{22,4}=0,2\left(mol\right)\left(1\right)\)
Theo PT: \(n_{O_2}=2n_{CH_4}+3n_{C_2H_4}=2x+3y=\dfrac{15,68}{22,4}=0,7\left(mol\right)\left(2\right)\)
Từ (1) và (2) \(\Rightarrow\left\{{}\begin{matrix}x=-0,1\\y=0,3\end{matrix}\right.\)
Đến đây thì ra số mol âm, bạn xem lại đề nhé.
a, PT: \(C_2H_4+3O_2\underrightarrow{t^o}2CO_2+2H_2O\)
Ta có: \(n_{C_2H_4}=\dfrac{3,36}{22,4}=0,15\left(mol\right)\)
Theo PT: \(n_{O_2}=3n_{C_2H_4}=0,45\left(mol\right)\)
\(\Rightarrow V_{O_2}=0,45.22,4=10,08\left(l\right)\)
b, Theo PT: \(n_{CO_2}=2n_{C_2H_4}=0,3\left(mol\right)\)
\(\Rightarrow V_{CO_2}=0,3.22,4=6,72\left(l\right)\)
c, PT: \(CO_2+Ca\left(OH\right)_2\rightarrow CaCO_{3\downarrow}+H_2O\)
Theo PT: \(n_{CaCO_3}=n_{CO_2}=0,3\left(mol\right)\)
\(\Rightarrow m_{\downarrow}=m_{CaCO_3}=0,3.100=30\left(g\right)\)
Bạn tham khảo nhé!
\(a)\\ CH_4 + 2O_2 \xrightarrow{t^o} CO_2 + 2H_2O\\ 2C_2H_2 + 5O_2 \xrightarrow{t^o} 4CO_2 + 2H_2O\\ b)\\ V_{CH_4} =a (lít) ; V_{C_2H_2} = b(lít)\\ \Rightarrow a + b = 7,84(1)\\ V_{O_2} = 2a + \dfrac{5}{2}b = 21,28(2)\\ (1)(2) \Rightarrow a = -3,36 < 0 ; b = 11,2\)
(Sai đề)
CH4+2O2-to>CO2+2H2O
x------2x---------x
C2H4+3O2-to>2CO2+2H2O
y----------3y--------2y
=>\(\left\{{}\begin{matrix}x+y=\dfrac{5,6}{22,4}\\2x+3y=\dfrac{13,44}{22,4}\end{matrix}\right.\)
=>x=0,15 mol , y=0,1 mol
=>%VCH4=\(\dfrac{0,15.22,4}{5,6}\).100=60%
=>%VC2H4=100-60=40%
b)
VCO2=(0,15+0,1.2).22,4=7,84l
mhh khí = 5,6/22,4 = 0,25 (mol)
nO2 = 13,44/22,4 = 0,6 (mol)
Gọi nC2H4 = a (mol); nCH4 = b (mol)
a + b = 0,25 (1)
PTHH:
C2H4 + 3O2 -> (t°) 2CO2 + 2H2O
Mol: a ---> 3a ---> 2a
CH4 + 2O2 -> (t°) CO2 + 2H2O
Mol: b ---> 2b ---> b
3a + 2b = 0,6 (2)
(1)(2) => a = 0,1 (mol); b = 0,15 (mol)
%VC2H4 = 0,1/0,25 = 40%
%VCH4 = 100% - 40% = 60%
VCO2 = (0,1 . 2 + 0,15) . 22,4 = 7,84 (l)
a, \(CH_4+2O_2\underrightarrow{t^o}CO_2+2H_2O\)
\(2C_2H_2+5O_2\underrightarrow{t^o}4CO_2+2H_2O\)
Ta có: \(n_{CH_4}+n_{C_2H_2}=\dfrac{6,72}{22,4}=0,3\left(mol\right)\left(1\right)\)
\(n_{CO_2}=n_{CH_4}+2n_{C_2H_2}=\dfrac{7,84}{22,4}=0,35\left(mol\right)\left(2\right)\)
Từ (1) và (2) \(\Rightarrow\left\{{}\begin{matrix}n_{CH_4}=0,25\left(mol\right)\\n_{C_2H_2}=0,05\left(mol\right)\end{matrix}\right.\)
\(\Rightarrow\left\{{}\begin{matrix}\%V_{CH_4}=\dfrac{0,25.22,4}{6,72}.100\%\approx83,33\%\\\%V_{C_2H_2}\approx16,67\%\end{matrix}\right.\)
Theo PT: \(n_{O_2}=2n_{CH_4}+\dfrac{5}{2}n_{C_2H_2}=0,625\left(mol\right)\Rightarrow m_{O_2}=0,625.32=20\left(g\right)\)
CH4+2O2-to>CO2+2H2O
x-----------2x
C2H4+3O2-to>2CO2+2H2O
y------------3y
=>\(\left\{{}\begin{matrix}x+y=0,25\\2x+3y=0,6\end{matrix}\right.\)
=>x=0,15 mol
y=0,1 mol
=>%CH4=\(\dfrac{0,15.24,79}{6,1975}\).100=60%
=>%C2H4=40%
=>VCO2=(0,15+0,2).24,79=8,6765l