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Câu hỏi: Đun 6,0 gam CH3COOH với C2H5OH dư (xúc tác H2SO4 đặc), thu được 6,6 gam este. Hiệu suất của phản ứng este hóa là
A. 50,00%.
B. 75,00%.
C. 90,00%.
D. 85,00%.
A. 50,00%.
B. 75,00%.
C. 90,00%.
D. 85,00%.
$\begin{aligned}
& \text{C}{{\text{H}}_{3}}\text{COOH + }{{\text{C}}_{2}}{{\text{H}}_{5}}\text{OH}\underset{{}}{\overset{{}}{\longleftrightarrow}}\text{ C}{{\text{H}}_{3}}\text{COO}{{\text{C}}_{2}}{{\text{H}}_{5}}\text{ + }{{\text{H}}_{2}}\text{O} \\
& \to \left\{ \left. \begin{aligned}
& {{\text{n}}_{\text{C}{{\text{H}}_{3}}\text{COOH}}}\text{ = 0,1 (mol)} \\
& {{\text{n}}_{\text{C}{{\text{H}}_{3}}\text{COO}{{\text{C}}_{2}}{{\text{H}}_{5}}}}\text{ = 0,075 (mol)} \\
\end{aligned} \right\} \right.\to \text{ H = 75 }\!\!\%\!\! \\
\end{aligned}$
& \text{C}{{\text{H}}_{3}}\text{COOH + }{{\text{C}}_{2}}{{\text{H}}_{5}}\text{OH}\underset{{}}{\overset{{}}{\longleftrightarrow}}\text{ C}{{\text{H}}_{3}}\text{COO}{{\text{C}}_{2}}{{\text{H}}_{5}}\text{ + }{{\text{H}}_{2}}\text{O} \\
& \to \left\{ \left. \begin{aligned}
& {{\text{n}}_{\text{C}{{\text{H}}_{3}}\text{COOH}}}\text{ = 0,1 (mol)} \\
& {{\text{n}}_{\text{C}{{\text{H}}_{3}}\text{COO}{{\text{C}}_{2}}{{\text{H}}_{5}}}}\text{ = 0,075 (mol)} \\
\end{aligned} \right\} \right.\to \text{ H = 75 }\!\!\%\!\! \\
\end{aligned}$
Đáp án B.
