The ester ethyl methanoate is prepared in a school laboratory by reacting a carboxylic acid with an alcohol. During the reaction, only $$\(50.0 \%\)$$ of the alcohol is converted into the ester. Which mass of alcohol is needed to prepare $$\(10.0 \mathrm{~g}\)$$ of the ester?
A.
\(\quad 3.11 \mathrm{~g}\)
B.
\(\quad 8.65 \mathrm{~g}\)
C.
\(\quad 12.4 \mathrm{~g}\)
D.
\(\quad 32.2 \mathrm{~g}\)
Exam No：9701_s20_qp_13 Year：2020 Question No：29
Answer:
C
Knowledge points:
18.2.1.1 the condensation reaction between an alcohol and a carboxylic acid with concentrated as catalyst
2.4.1.1 reacting masses (from formulae and equations) including percentage yield calculations
Solution:
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