Theo gt ta có: $n_{O_2}=0,6(mol);n_{hh}=0,25(mol)$

a, $CH_4+2O_2\rightarrow CO_2+2H_2O$

$C_2H_4+3O_2\rightarrow 2CO_2+2H_2O$

Gọi số mol CH4 và C2H4 lần lượt là a;b(mol)

Ta có: $a+b=0,25;2a+3b=0,6\Rightarrow a=0,15;b=0,1$

b, Suy ra $\%V_{CH_4}=60\%;\%V_{C_2H_4}=40\%$

c, Ta có: $n_{CaCO_3}=n_{CO_2}=0,15+0,1.2=0,35(mol)\Rightarrow m_{CaCO_3}=35(g)$

\(a)\\ CH_4 + 2O_2 \xrightarrow{t^o} CO_2 + 2H_2O\\ C_2H_4 + 3O_2 \xrightarrow{t^o} 2CO_2 + 2H_2O\\ b)\ V_{CH_4} = a(lít) ; V_{C_2H_4} = b(lít)\\ \Rightarrow a + b = 5,6(1)\\ V_{O_2} = 2a + 3b = 13,44(2)\\ (1)(2)\Rightarrow a = 3,36 ; b = 2,24\\ \%V_{CH_4} = \dfrac{3,36}{5,6}.100\% = 60\%\\ \%V_{C_2H_4} = 40\%\\ c) V_{CO_2} = a + 2b = 7,84(lít)\\\)

\(CO_2 + Ca(OH)_2 \to CaCO_3 + H_2O\\ n_{CaCO_3} = n_{CO_2} = \dfrac{7,84}{22,4} = 0,35(mol)\\ \Rightarrow m_{CaCO_3} = 0,35.100 = 35(gam)\)

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

\(C_2H_4+3O_2\underrightarrow{t^o}2CO_2+2H_2O\)

b, Giả sử: \(\left\{{}\begin{matrix}n_{CH_4}=x\left(mol\right)\\n_{C_2H_4}=y\left(mol\right)\end{matrix}\right.\)

\(\Rightarrow x+y=\dfrac{5,6}{22,4}=0,25\left(1\right)\)

Ta có: \(n_{O_2}=\dfrac{13,44}{22,4}=0,6\left(mol\right)\)

Theo PT: \(n_{O_2}=2n_{CH_4}+3n_{C_2H_4}=2x+3y\)

⇒ 2x + 3y = 0,6 (2)

Từ (1) và (2) \(\Rightarrow\left\{{}\begin{matrix}x=0,15\left(mol\right)\\y=0,1\left(mol\right)\end{matrix}\right.\)

\(\Rightarrow\left\{{}\begin{matrix}\%V_{CH_4}=\dfrac{0,15}{0,25}.100\%=60\%\\\%V_{C_2H_4}=40\%\end{matrix}\right.\)

b, Theo PT: \(n_{CO_2}=n_{CH_4}+2n_{C_2H_4}=0,35\left(mol\right)\)

PT: \(CO_2+Ca\left(OH\right)_2\rightarrow CaCO_{3\downarrow}+H_2O\)

Theo PT: \(n_{CaCO_3}=n_{CO_2}=0,35\left(mol\right)\)

\(\Rightarrow m_{CaCO_3}=0,35.100=35\left(g\right)\)

Bạn tham khảo nhé!

\(a,n_{hh\left(CH_4,C_2H_4,C_2H_2\right)}=\dfrac{8,96}{22,4}=0,4\left(mol\right)\\ n_{CH_4}=\dfrac{2,24}{22,4}=0,1\left(mol\right)\\ n_{hh\left(C_2H_4,C_2H_2\right)}=0,4-0,1=0,3\left(mol\right)\)

Gọi \(\left\{{}\begin{matrix}n_{C_2H_4}=a\left(mol\right)\\n_{C_2H_2}=b\left(mol\right)\end{matrix}\right.\)

=> \(\left\{{}\begin{matrix}a+b=0,3\\28a+26b=8,1\end{matrix}\right.\Leftrightarrow a=b=0,15\left(mol\right)\)

PTHH:

\(CH\equiv CH+2Br-Br\rightarrow CHBr_2-CHBr_2\)

\(CH_2=CH_2+Br-Br\rightarrow CH_2Br-CH_2Br\)

\(b,\left\{{}\begin{matrix}\%V_{CH_4}=\dfrac{0,1}{0,4}.100\%=25\%\\\%V_{C_2H_4}=\%V_{C_2H_2}=\dfrac{0,15}{0,4}.100\%=37,5\%\end{matrix}\right.\)

c, PTHH:

\(CH_4+2O_2\underrightarrow{t^o}CO_2+2H_2O\\ C_2H_2+\dfrac{5}{2}O_2\underrightarrow{t^o}2CO_2+H_2O\\ C_2H_4+3O_2\underrightarrow{t^o}2CO_2+2H_2O\\ Ba\left(OH\right)_2+CO_2\rightarrow BaCO_3\downarrow+H_2O\\ \rightarrow n_{BaCO_3}=n_{CO_2}=0,1+0,15.0,15.2=0,7\left(mol\right)\\ m_{BaCO_3}=0,7.197=137,9\left(g\right)\)

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

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

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

C₂H₂ + H₂ C₂H₄

C₂H₂ + H₂ C₂H₆

Khi cho hỗn hợp B qua dd nước Br₂ chỉ có C₂H₄ và C₂H₂ phản ứng C₂H₂ +2Br₂ → C₂H₂Br₄

C₂H₄ + Br₂ → C₂H₄Br₂

=> khối lượng bình Br₂ tăng chính bằng khối lượng của C₂H₂ và C₂H₄

m_C2H2 + m_C2H4 = 4,1 (g)    

Hỗn hợp khí D đi ra là CH₄, C₂H₆ và H₂

CH₄ + 2O₂ → t ∘  CO₂ + 2H₂O

C₂H₆ + O₂  → t ∘  2CO₂ + 3H₂O

2H₂ + O₂  → t ∘  2H₂O

Bảo toàn nguyên tố O cho quá trình đốt cháy hh D ta có:

2n_CO2 = 2n_O2 – n_H2O => n_CO2 = ( 0,425. 2– 0,45)/2 = 0,2 (mol)

Bảo toàn khối lượng : m_{hh D} = m_CO2 + m_H2O – m_O2 = 0,2.44 + 0,45.18 – 0,425.32 = 3,3 (g)

Bảo toàn khối lương: m_A = (m_C2H2 + m_C2H4) + m_{hh D} = 4,1 + 3,3 = 7,4 (g)

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: \(n_{O_2}=3n_{C_2H_4}=0,15\left(mol\right)\Rightarrow V_{O_2}=0,15.22,4=3,36\left(l\right)\)

\(\Rightarrow V_{kk}=\dfrac{V_{O_2}}{20\%}=16,8\left(l\right)\)

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

nCO2=8,96/22,4=0,4 mol

=> nC=nCO2=0,4 mol

mC=0,4.12=4,8g

=> mH=5,8-4,8=1g

nH=1 mol -> nH2O=0,5

nH=0,5 mol

Pt: CnH2n+2 + (3n+1/2)O2-> nCO2 + (n+1)H2O

                                                0,4          0,5 mol

=> n/0,4=n+1/0,5 -> n=4

Vậy cthh cần tìm là C4H10