Cho 21,8 gam hỗn hợp gồm phenyl axetat và etyl benzoat tác dụng vừa đủ

Đáp án A.

$$\begin{gathered} C{H}_{3}COO{C}_6{H}_5+2NaOH\to C{H}_{3}COONa+C_6{H}_{5}ONa+H_{2}O \\ {C}_6{H}_{5}COOC{H}_{2}C{H}_3+NaOH\to C_6{H}_{5}COONa+C{H}_{3}C{H}_{2}OH \end{gathered}$$

$21,8gam\left\{\begin{array}{l}Phenylaxetat:x\\ Etylbenzoat:y\end{array}\right.$

$\left\{\begin{array}{l}2x+y=0,2\left(n_{NaOH}\right)\\ 136x+150y=21,8\end{array}\right.\to \left\{\begin{array}{l}x=0,05\\ y=0,1\end{array}\right.$

BTKL: $m_{este}+m_{NaOH}=$ m_rắn $+m_{ancol}+m_{H_{2}O}$

 m_rắn $=21,8+0,2.40-0,05.18-0,1.46=24,3$ gam.