11. Gọi anetol cần tìm : $C_xH_yO_z$
Tỉ lệ : $x : y : z=\dfrac{81,081\%}{12}: \dfrac{8,108\%}{1}: \dfrac{10,811\%}{16}$
$= 6,75675:8,108:0,6756875$
$= 10:12:1$
$\to C_{10}H_{12}O$
Mà $(C_{10}H_{12}O).n=148$
$\to n=1$
12. Tỉ lệ :$x:y:z = \dfrac{54,545\%}{12}:\dfrac{9,091\%}{1}:\dfrac{36,364\%}{16}$
$= 2:4:1$
$M_X=44.2=88$
$(C_2H_4O)n=88$
$\to n = 2$
$\Rightarrow$ CTPT cần tìm : $C_4H_8O_2$
13.Gọi CTPT cần tìm : $C_xH_y$
$\%C= 100\%-11,765\%= 88,235\%$
Tỉ lệ : $x:y=\dfrac{88,235\%}{12}:\dfrac{11,765\%}{1}= 1:2$
$+, (CH_2)n=136$
$\Rightarrow n = 8,5$
$\to C_9H_{17}$
