Hỗn hợp X gồm axit oleic, axit stearic

Chọn đáp án B.

Đặt $\left\{\begin{array}{l}{\left(C_{17}{H}_{x}COO\right)}_3{C}_3{H}_5:amol\\ C_{17}{H}_{y}COOH:bmol\\ H_{2}O:cmol\end{array}\right.\Rightarrow \left\{\begin{array}{l}6a+2b+\mathrm{2,89.2}=\mathrm{2,04.2}+c\\ 57a+18b=\mathrm{2,04}\\ 110a+36b=2c+\mathrm{0,08.2}\end{array}\right.\Rightarrow \left\{\begin{array}{l}a=\mathrm{0,02}\\ b=\mathrm{0,05}\\ c=\mathrm{1,92}\end{array}\right.$

Ta có:$n_{B{r}_2}=\mathrm{0,08}mol\Rightarrow X\text{ gom}\left\{\begin{array}{l}{C}_{17}{H}_{33}COOH:\mathrm{0,04}mol\\ C_{17}{H}_{35}COOH:\mathrm{0,01}mol\\ {\left(C_{17}{H}_{33}COO\right)}_2{C}_3{H}_5\left(C_{17}{H}_{35}COO\right):\mathrm{0,02}mol\end{array}\right.\Rightarrow m_{triglixerit}=\mathrm{17,72}\left(g\right)$