X, Y là 2 axit đơn chức cùng dãy đồng đẳng, T là este 2 chức

* Hướng dẫn giải

Đáp án A

$$\begin{gathered} + E\stackrel{AgN{O}_3/N{H}_3, t^o}{\to }Ag\Rightarrow E gồm \left\{X: HCOOH (k=1) \\ Y: C_n{H}_{2n+1}COOH (k=1) \\ T: HCOO{C}_m{H}_{2m}OOC{C}_n{H}_{2n+1}(k=2, n⩾2)\right. \\ \Rightarrow \left\{n_T=n_{C{O}_2}-n_{H_{2}O}=0,32-0,29=0,03 \\ BT E:2n_X+2n_T=n_{Ag}=0,16 \\ BT O:2n_X+2n_Y+4n_T=\frac{8,58-0,32.12-0,29.2}{16}\right.\Rightarrow \left\{n_T=0,03 \\ {n}_X=0,05 \\ {n}_Y=0,02 \\ \right. \\ \Rightarrow BT C:0,05+(n+1)0,02+(2+m+n)0,03=0,32\Rightarrow n=2, m=3 \\ + \left\{n_X+n_Y+2n_T<n_{NaOH}\Rightarrow NaOH dư \\ \underset{8,58}{\underbrace{m_E}}+\underset{0,15.40}{\underbrace{m_{NaOH}}}=\boxed{\underset{?=11,04}{\underbrace{m_{chất rắn}}}}+\underset{0,07.18}{\underbrace{m_{H_{2}O}}}+\underset{0,03.76}{\underbrace{m_{C_3{H}_6{\left(OH\right)}_2}}}\right. \end{gathered}$$