Pentyl butanoate is responsible for some of the flavour in apricots and strawberries - Scottish Highers Chemistry - Question 4 - 2017
Question 4
Pentyl butanoate is responsible for some of the flavour in apricots and strawberries.
(a) Hydrolysis of pentyl butanoate using sodium hydroxide produces an alcohol ... show full transcript
Worked Solution & Example Answer:Pentyl butanoate is responsible for some of the flavour in apricots and strawberries - Scottish Highers Chemistry - Question 4 - 2017
Step 1
Name the alcohol that would be formed when pentyl butanoate is hydrolysed.
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Answer
The alcohol formed from the hydrolysis of pentyl butanoate is Pentan-1-ol.
Step 2
Draw a structural formula for the sodium salt of the carboxylic acid that would be formed.
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Answer
The structural formula for the sodium salt of the carboxylic acid formed from pentyl butanoate hydrolysis is as follows:
O
||
Na+ - C - C - C - C - C
| | | | |
H H H H H
Step 3
Name this class of compounds.
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Answer
The class of compounds that fats and oils belong to is known as esters.
Step 4
State a use for sodium salts of fatty acids.
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Sodium salts of fatty acids are commonly used as soaps or emulsifiers.
Step 5
Calculate the energy released, in kJ, by combustion of 10 grams of stearic acid.
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Answer
To calculate the energy released from 10 grams of stearic acid, we first determine the number of moles of stearic acid:
Moles of stearic acid=28410≈0.0353 moles
Given that combusting 1 mole of stearic acid produces 623 kJ of energy:
Total energy produced:
0.0353 moles×623 kJ/mole≈22.01 kJ
Thus, the energy released is approximately 22.01 kJ.
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