Ai giải hộ em câu 2 với

Gọi $\rm C_nH_{2n+2}\ (n\geqslant 1)$ là CTPT của ankan $A$

$\rm C_nH_{2n+2} +\dfrac{3n+1}{2}O_2 \xrightarrow{t^\circ} nCO_2 + (n+1)H_2O$

$n_{CO_2} =\dfrac{0,27664}{22,4}=0,01235\,mol$

$\Rightarrow n_A =\dfrac{0,01235}{n}\ mol$

$\Rightarrow M_A = \dfrac{0,17784}{\dfrac{0,01235}{n}}\ g/mol$

$\Rightarrow 14n + 2 = 14,4n$

$\Rightarrow n = 5$

$\Rightarrow \rm A:\ \ C_5H_{12}$

$\rm CH_3-CH_2-CH_2-CH_2-CH_3:\ n-pentan$

$\rm CH_3-CH(CH_3)-CH_2-CH_:\ 2-metylbutan \ (Isopentan)$

$\rm CH_3-C(CH_3)_2-CH_3:\ 2,2-đimetylpropan\ (Neopentan)$