X : C_nH_2n+2

\(n_{CO_2} = \dfrac{5,6}{22,4} = 0,25(mol)\\ \Rightarrow n_X = \dfrac{0,25}{n}(mol)\\ \Rightarrow M_X = 14n + 2 = \dfrac{3,6}{\dfrac{0,25}{n}} = 14,4n\\ \Rightarrow n = 5\)

Vậy CTPT của X: C₅H₁₂

CTCT :

\(CH_3-CH_2-CH_2-CH_2-CH_3\ : pentan\\ CH_3-CH(CH_3)-CH_2-CH_3 : 2-metylbutan\\ CH_3-C(CH_3)_2-CH_3 : 2,2-đimetylpropan\\ \)

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

\(n_{H_2O} = \dfrac{9}{18} = 0,5(mol)\\ n_{CO_2} = \dfrac{8,96}{22,4} = 0,4(mol)\\ \Rightarrow n_X = n_{H_2O} - n_{CO_2}= 0,5 - 0,4 = 0,1(mol)\\ X\ :\ C_nH_{2n+2}(n \geq 1)\\ n = \dfrac{n_{CO_2}}{n_X} = \dfrac{0,4}{0,1} = 4\\ \Rightarrow CTPT\ X\ : C_4H_{10}\)

CTCT :

\(CH_3-CH_2-CH_2-CH_3 : butan\\ CH_3-CH(CH_3)-CH_3 : 2-metylpropan\)

a) $n_{CO_2} = \dfrac{26,4}{44} = 0,6(mol)$

Gọi CTHH của ankan là $C_nH_{2n+2}$

Bảo toàn nguyên tố với C : $n_{ankan} = \dfrac{1}{n}n_{CO_2} = \dfrac{0,6}{n}(mol)$

$\Rightarrow \dfrac{0,6}{n}(14n+2} = 8,7$

$\Rightarrow n = 4$

Vậy CTHH cần tìm : $C_4H_{10}$

CTCT : 

$CH_3-CH_2-CH_2-CH_3$

$CH_3-CH(CH_3)-CH_3$

b) $CH_3-CH_2-CH_2-CH_3 + Cl_2 \to CH_2Cl-CH_2-CH_2-CH_3 + HCl$

c) $n_{C_4H_{10}} = \dfrac{5,8}{58} = 0,1(mol)$

$C_4H_{10} + \dfrac{13}{2}O_2 \xrightarrow{t^o} 4CO_2 + 5H_2O$

$n_{O_2} = \dfrac{13}{2}n_{O_2} = 0,65(mol)$
$V_{O_2} = 0,65.22,4 = 14,56(l)$

$V_{kk} = 14,56 : 21\% = 69,33(l)$

\(n_C=n_{CO_2}=\dfrac{1,12}{22,4}=0,05\left(mol\right)\\ \Rightarrow n_H=\dfrac{0,72-0,05.12}{1}=0,12\left(mol\right)\\ \Rightarrow n_{H_2O}=\dfrac{1}{2}n_H=0,06\left(mol\right)\\ \Rightarrow n_{ankan}=n_{H_2O}-n_{CO_2}=0,01\left(mol\right)\\ \Rightarrow M_{C_nH_{2n+2}}=\dfrac{0,72}{0,01}=72\left(g/mol\right)\\ \Rightarrow14n+2=72\\ \Leftrightarrow n=5\)

Vậy X là C₅H₁₂

Đáp án là C.

Đáp án là C.

n x = 0 , 3   → n a n k a n = n a n k e n   = 0 , 15   → n a n k e n ( Y ) = 0,2 – 0,15  → M a n k e n   = 4 , 2 0 , 1 = 42   → C 3 H 6

n C O 2 = 0 , 6   → C Y ¯   = 3   → C 3 H 8 → C 6 H 14   ( h e x a n )

\(n_{H_2O}=\dfrac{12.6}{18}=0.7\left(mol\right)\)

\(n_{CO_2}=\dfrac{13.44}{22.4}=0.6\left(mol\right)\)

\(CT:C_nH_{2n+2}\)

\(\dfrac{n}{2n+2}=\dfrac{0.6}{0.7\cdot2}\Rightarrow n=6\)

\(CT:C_6H_{14}\)