\(n_{CO_2}=\dfrac{48,4}{44}=1,1\left(mol\right)\\ n_{H_2O}=\dfrac{29,7}{18}=1,65\left(mol\right)\\ Vì:n_{H_2O}>n_{CO_2}\Rightarrow hhZ:hh.ankan\\ CTTQ:C_aH_{2a+2}\\ Ta.có:1< \dfrac{n_{CO_2}}{n_{H_2O}}=\dfrac{1,65}{1,1}=1,5< 2\\ \Rightarrow hh.Z:50\%V_{CH_4},50\%V_{C_2H_6}\\ \Rightarrow\%m_{\dfrac{CH_4}{hhZ}}=\dfrac{16}{16+28}.100\approx36,364\%\\ \Rightarrow\%m_{\dfrac{C_2H_6}{hhZ}}\approx63,636\%\)

Bài 1 : 

\(n_{H_2O}=\dfrac{2.88}{18}=0.16\left(mol\right)\)

\(n_{CO_2}=\dfrac{4.84}{44}=0.11\left(mol\right)\)

\(n_{hh}=\dfrac{1.12}{22.4}=0.05\left(mol\right)\)

\(n_{H_2O}< n_{CO_2}\Rightarrow CT:C_{\overline{n}}H_{2\overline{n}+2}\)

\(\overline{n}=\dfrac{0.11}{0.05}=2.2\)

\(CT:C_2H_6\left(amol\right),C_3H_8\left(bmol\right)\)

\(\left\{{}\begin{matrix}a+b=0.05\\2a+3b=0.11\end{matrix}\right.\)

\(\Rightarrow\left\{{}\begin{matrix}a=0.04\\b=0.01\end{matrix}\right.\)

\(\%C_2H_6=\dfrac{0.04}{0.05}\cdot100\%=80\%,\%C_3H_8=20\%\)

Bài 1 :

\(n_{H_2O}>n_{CO_2}\Rightarrow X:ankan\)

\(Đặt:CTHH:C_nH_{2n+2}\)

\(\dfrac{n}{2n+2}=\dfrac{0.1}{0.3}\Rightarrow n=2\)

\(Vậy:Xlà:C_2H_6\left(etan\right)\)

Bài 1 

\(n_{CO_2} < n_{H_2O} \to\) X là ankan (C_nH_2n+2)

\(n_X = n_{H_2O} - n_{CO_2} = 0,15 - 0,1 = 0,05(mol)\)

Suy ra:  \(n = \dfrac{n_{CO_2}}{n_X} = \dfrac{0,1}{0,05} = 2\)

Vậy X là C₂H₆(etan)

Bài 2 : 

 Hỗn hợp có dạng C_nH_2n+2

\(n_{hỗn\ hợp} = \dfrac{4,48}{22,4} = 0,2(mol)\\ n_{H_2O} = \dfrac{18}{18} = 1(mol)\\ \Rightarrow n + 2 = \dfrac{2n_{H_2O}}{n_{hh}} = 5\\ Suy\ ra\ n = 3\)

\(\Rightarrow n_{CO_2} = 3n_{hh} = 0,2.3 = 0,6(mol)\\ \Rightarrow V = 0,6.22,4 = 13,44(lít)\)

Bài 2 :

\(n_{H_2O}=\dfrac{18}{18}=1\left(mol\right)\)

\(n_{ankan}=\dfrac{4.48}{22.4}=0.2\left(mol\right)\)

\(n_{CO_2}=n_{H_2O}-n_{ankan}=1-0.2=0.8\left(mol\right)\)

\(V_{CO_2}=0.8\cdot22.4=17.92\left(l\right)\)

Đáp án : D

n C O 2  = 7,84/22,4 = 0,35 mol

n H 2 O = 11,7/18 = 0,65 mol

⇒  n C O 2 <  n H 2 O  ⇒ ankan

⇒ Chọn B.

\( n_{H_2O} = \dfrac{11,7}{18} = 0,65\ mol\\ n_{CO_2} = \dfrac{17,6}{44} = 0,4\ mol\\ \Rightarrow Hidrocacbon :\ C_nH_{2n+2}\\ n_{hidrocacbon} = n_{H_2O} - n_{CO_2} = 0,65 - 0,4 = 0,25(mol)\\ \Rightarrow n = \dfrac{n_{CO_2}}{n_{hidrocacbon}} = \dfrac{0,4}{0,25} = 1,6\\ 1< n=1,6<2\Rightarrow Hidrocacbon:\ CH_4,C_2H_6\\ n_{CH_4} = a\ mol ; n_{C_2H_6} = b(mol)\\ \Rightarrow a + b = 0,25 ; n_{CO_2} =a + 2b = 0,4\\ \Rightarrow a = 0,1 ; b = 0,15\\ \Rightarrow \%m_{CH_4} = \dfrac{0,1.16}{0,1.16+0,15.30}.100\% = 26,23\%\)

\(\%m_{C_2H_6} = 100\% - 26,23\% = 73,77\%\)

Ta có: \(n_{O_2\left(banđau\right)}=\dfrac{62}{32}=2\left(mol\right)\)

 \(n_{CO_2}=n_{CaCO_3}=\dfrac{100}{100}=1\left(mol\right)\)

Khí thoát ra khỏi bình là O₂ dư.

\(\Rightarrow n_{O_2\left(dư\right)}=\dfrac{pV}{RT}=\dfrac{0,4.11,2}{0,082.273}=0,2\left(mol\right)\)

\(\Rightarrow n_{O_2\left(pư\right)}=2-0,2=1,8\left(mol\right)\)

BTNT O, có: \(2n_{O_2\left(pư\right)}=2n_{CO_2}+n_{H_2O}\)

\(\Rightarrow n_{H_2O}=2.1,8-2.1=1,6\left(mol\right)\)

Vì đốt cháy 2 hiđrocacbon thu được n_H2O > n_CO2 nên A và B là ankan.

⇒ n_ankan = 1,6 - 1 = 0,6 (mol)

Gọi CTPT chung của A và B là \(C_{\overline{n}}H_{2\overline{n}+2}\)

\(\Rightarrow\overline{n}=\dfrac{1}{0,6}=1,667\)

Vậy: A và B là CH₄ và C₂H₆.

Bạn tham khảo nhé!