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3 tháng 4 2023

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: \(n_{Br_2}=n_{C_2H_4}=0,1\left(mol\right)\Rightarrow V_{ddBr_2}=\dfrac{0,1}{1}=0,1\left(l\right)\)

\(m_{C_2H_4}=0,1.28=2,8\left(g\right)\)

13 tháng 2 2022

Gọi số mol CO, CH4 là a, b (mol)

=> \(a+b=\dfrac{5,6}{22,4}=0,25\left(mol\right)\)

\(n_{O_2}=\dfrac{4,48}{22,4}=0,2\left(mol\right)\)

PTHH: 2CO + O2 --to--> 2CO2

              a--->0,5a

            CH4 + 2O2 --to--> CO2 + 2H2O

             b--->2b

=> 0,5a + 2b = 0,2

=> a = 0,2 (mol); b = 0,05 (mol)

=> \(\left\{{}\begin{matrix}\%V_{CO}=\dfrac{0,2}{0,25}.100\%=80\%\\\%V_{CH_4}=\dfrac{0,05}{0,25}.100\%=20\%\end{matrix}\right.\)

13 tháng 2 2022

\(n_{hh}=\dfrac{5,6}{22,4}=0,25\left(mol\right)\\ n_{O_2}=\dfrac{4,48}{22,4}=0,2\left(mol\right)\\ 2CO+O_2\rightarrow\left(t^o\right)2CO_2\\ CH_4+2O_2\rightarrow\left(t^o\right)CO_2+2H_2O\\ Đặt:n_{CO}=a\left(mol\right);n_{CH_4}=b\left(mol\right)\left(a,b>0\right)\\ \Rightarrow\left\{{}\begin{matrix}a+b=0,25\\0,5a+2b=0,2\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}a=0,2\\b=0,05\end{matrix}\right.\\ \Rightarrow\%V_{\dfrac{CO}{hh}}=\%n_{\dfrac{CO}{hh}}=\dfrac{a}{a+b}.100\%=\dfrac{0,2}{0,25}.100=80\%;\%V_{CH_4}=100\%-80\%=20\%\)

14 tháng 3 2022

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)

14 tháng 3 2022

sao anh gọi em là xoá bỏ :))

 

25 tháng 2 2022

a) \(m_{tăng}=m_{C_2H_4}=0,84\left(g\right)\)

=> \(n_{C_2H_4}=\dfrac{0,84}{28}=0,03\left(mol\right)\)

Gọi số mol CH4, H2 trong 3360 ml A là a, b

=> \(a+b=\dfrac{3,36}{22,4}-0,03=0,12\left(mol\right)\) (1)

Gọi số mol CH4, H2 trong 0,7 lít hh là ak, bk

=> ak + bk + 0,03k = \(\dfrac{0,7}{22,4}=0,03125\) (2)

Và 16ak + 2bk + 0,84k = 0,4875 (3)

(1)(2)(3) => \(\left\{{}\begin{matrix}a=0,09\left(mol\right)\\b=0,03\left(mol\right)\\k=\dfrac{5}{24}\end{matrix}\right.\)

\(\left\{{}\begin{matrix}\%V_{C_2H_4}=\dfrac{0,03}{0,15}.100\%=20\%\\\%V_{CH_4}=\dfrac{0,09}{0,15}.100\%=60\%\\\%V_{H_2}=\dfrac{0,03}{0,15}.100\%=20\%\end{matrix}\right.\)

b) 

\(n_{C_2H_4}=\dfrac{1,68}{22,4}.20\%=0,015\left(mol\right)\)

\(n_{CH_4}=\dfrac{1,68}{22,4}.60\%=0,045\left(mol\right)\)

\(n_{H_2}=\dfrac{1,68}{22,4}.20\%=0,015\left(mol\right)\)

Bảo toàn C: \(n_{CO_2}=0,075\left(mol\right)\)

Bảo toàn H: \(n_{H_2O}=0,135\left(mol\right)\)

\(n_{Ca\left(OH\right)_2}=0,05.1=0,05\left(mol\right)\)

\(m_{ddCa\left(OH\right)_2}=1000.1,025=1025\left(g\right)\)

PTHH: Ca(OH)2 + CO2 --> CaCO3 + H2O

             0,05---->0,05----->0,05

            CaCO3 + CO2 + H2O --> Ca(HCO3)2

           0,025<--0,025------------>0,025

\(m_{CaCO_3}=\left(0,05-0,025\right).100=2,5\left(g\right)\)

mdd sau pư = 1025 + 0,075.44 + 0,135.18 - 2,5 = 1028,23 (g)

\(C\%_{Ca\left(HCO_3\right)_2}=\dfrac{0,025.162}{1028,23}.100\%=0,3939\%\)

28 tháng 2 2021

\(\left\{{}\begin{matrix}n_{CH_4}=a\left(mol\right)\\n_{C_2H_4}=b\left(mol\right)\end{matrix}\right.\)\(\Rightarrow a + b = \dfrac{3,36}{22,4} = 0,15(1) \)

\(CH_4 + 2O_2 \xrightarrow{t^o} CO_2 + 2H_2O\\ C_2H_4 + 3O_2 \xrightarrow{t^o} 2CO_2 + 2H_2O\\ n_{CO_2} = a + 2b = \dfrac{4,48}{22,4} = 0,2(2)\)

Từ (1)(2) suy ra: a = 0,1 ; b = 0,05

Suy ra:

\(\%V_{CH_4} = \dfrac{0,1}{0,15}.100\% = 66,67\%\\ \%V_{C_2H_4} = 100\% - 66,67\% = 33,33\%\)

b)

\(C_2H_4 + Br_2 \to C_2H_4Br_2\\ n_{Br_2} = n_{C_2H_4} = 0,05(mol)\\ \Rightarrow m_{Br_2} = 0,05.160 = 8\ gam\)

26 tháng 12 2022

a)

$CH_4 + 2O_2 \xrightarrow{t^o} CO_2 + 2H_2O$
$C_2H_4 + 3O_2 \xrightarrow{t^o} 2CO_2 + 2H_2O$

$CO_2 + Ba(OH)_2 \to BaCO_3 + H_2O$

b)

Gọi $n_{CH_4} = a(mol) ; n_{C_2H_4} = b(mol)$
$\Rightarorw a + b = \dfrac{1,68}{22,4} = 0,075(1)$

Theo PTHH : $n_{BaCO_3} = n_{CO_2} = a + 2b = \dfrac{19,7}{197} = 0,1(2)$
Từ (1)(2) suy ra : a = 0,05 ; b = 0,025

$\%V_{CH_4} = \dfrac{0,05}{0,075}.100\% = 66,67\%$

$\%V_{C_2H_4} = 100\% - 66,67\% = 33,33\%$

c) $n_{O_2} = 2n_{CH_4} + 3n_{C_2H_4} = 0,175(mol)$
$\Rightarrow V_{O_2} = 0,175.22,4 = 3,92(lít)$
$\Rightarrow V_{kk} = 5V_{O_2} = 19,6(lít)$

19 tháng 3 2022

a) Gọi số mol CH4, C2H4 là a, b (mol)

=> \(\left\{{}\begin{matrix}16a+28b=11,6\\a+b=\dfrac{11,2}{22,4}=0,5\end{matrix}\right.\)

=> a = 0,2 (mol); b = 0,3 (mol)

\(\left\{{}\begin{matrix}\%V_{CH_4}=\dfrac{0,2}{0,5}.100\%=40\%\\\%V_{C_2H_4}=\dfrac{0,3}{0,5}.100\%=60\%\end{matrix}\right.\)

\(\left\{{}\begin{matrix}\%m_{CH_4}=\dfrac{0,2.16}{11,6}.100\%=27,586\%\\\%m_{C_2H_4}=\dfrac{0,3.28}{11,6}.100\%=72,414\%\end{matrix}\right.\)

b) 

\(n_{C_2H_4}=\dfrac{5,6.60\%}{22,4}=0,15\left(mol\right)\)

mtăng = mC2H4 = 0,15.28 = 4,2 (g)

2 tháng 5 2023

\(n_{C_2H_4}=\dfrac{8,96}{22,4}=0,4\left(mol\right)\\ PTHH:C_2H_4+3O_2\rightarrow\left(t^o\right)2CO_2+2H_2O\\ n_{O_2}=3.0,4=1,2\left(mol\right);n_{CO_2}=0,4.2=0,8\left(mol\right)\\ a,V_{O_2\left(đktc\right)}=22,4.1,2=26,88\left(l\right)\\ b,V_{kk\left(đktc\right)}=\dfrac{100}{20}.26,88=134,4\left(l\right)\\ c,CO_2+Ca\left(OH\right)_2\rightarrow CaCO_3\downarrow\left(trắng\right)+H_2O\\ n_{CaCO_3}=n_{CO_2}=0,8\left(mol\right)\\ m_{kết.tủa}=m_{CaCO_3}=100.0,8=80\left(g\right)\)

20 tháng 2 2021

PT: \(CH_4+2O_2\underrightarrow{t^o}CO_2+2H_2O\)

\(2C_2H_2+5O_2\underrightarrow{t^o}4CO_2+2H_2O\)

a, Giả sử: \(\left\{{}\begin{matrix}n_{CH_4}=x\left(mol\right)\\n_{C_2H_2}=y\left(mol\right)\end{matrix}\right.\)

\(\Rightarrow x+y=\dfrac{22,4}{22,4}=1\left(mol\right)\left(1\right)\)

Ta có: \(n_{CO_2}=\dfrac{35,84}{22,4}=1,6\left(mol\right)\)

Theo PT: \(\Sigma n_{CO_2}=n_{CH_4}+2n_{C_2H_2}\)

\(\Rightarrow x+2y=1,6\left(2\right)\)

Từ (1) và (2) \(\Rightarrow\left\{{}\begin{matrix}x=0,4\left(mol\right)\\y=0,6\left(mol\right)\end{matrix}\right.\)

\(\Rightarrow\left\{{}\begin{matrix}\%V_{CH_4}=\dfrac{0,4}{1}.100\%=40\%\\\text{ }\%V_{C_2H_2}=60\%\end{matrix}\right.\)

b, Theo PT: \(\Sigma n_{O_2}=2n_{CH_4}+\dfrac{5}{2}n_{C_2H_2}=2,3\left(mol\right)\)

\(\Rightarrow m_{O_2}=2,3.32=73,6\left(g\right)\)

c, PT: \(CO_2+2NaOH\rightarrow Na_2CO_3+H_2O\)

Theo PT: \(n_{Na_2CO_3}=n_{CO_2}=1,6\left(mol\right)\)

\(\Rightarrow C_{M_{Na_2CO_3}}=\dfrac{1,6}{0,8}=2M\)

Bạn tham khảo nhé!

 

20 tháng 2 2021

\(Đặt:n_{C_2H_2}=a\left(mol\right),n_{CH_4}=b\left(mol\right)\)

\(n_{hh}=a+b=0.15\left(mol\right)\left(1\right)\)

\(C_2H_2\rightarrow2CO_2\)

\(CH_4\rightarrow CO_2\)

\(n_{CO_2}=2a+b=0.2\left(mol\right)\left(2\right)\)

\(\left(1\right),\left(2\right):a=0.05,b=0.1\)

\(\%C_2H_2=\dfrac{0.05}{0.15}\cdot100\%=33.33\%\)

\(\%CH_4=66.67\%\)

\(2NaOH+CO_2\rightarrow Na_{_{ }2}CO_3+H_2O\)

\(0.4...............0.2............0.2\)

\(C_{M_{Na_2CO_3}}=\dfrac{0.2}{0.5}=0.4\left(M\right)\)

\(C_{M_{NaOH\left(dư\right)}}=\dfrac{0.5-0.4}{0.5}=0.2\left(M\right)\)