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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
Step 2
Draw a structural formula for the sodium salt of the carboxylic acid that would be formed.
Answer
The structural formula for the sodium salt of the carboxylic acid can be represented as:
O
||
Na+ - C - C - C - C - H
| | | | H
H H H H
Note: Ensure the sodium ion (Na+) is correctly indicated in relation to the carboxylate group.
Step 3
Step 4
Step 5
Calculate the energy released, in kJ, by combustion of 10 grams of stearic acid.
Answer
To find the energy released from 10 grams of stearic acid, we first calculate the number of moles of stearic acid.
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Calculate moles of stearic acid:
n = rac{10 ext{ g}}{284 ext{ g/mol}} = 0.0352 ext{ mol}
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Energy released per mole: 623 kJ
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Total energy released:
= 0.0352 ext{ mol} imes 623 ext{ kJ/mol} = 21.94 ext{ kJ}
Thus, the energy released by the combustion of 10 grams of stearic acid is approximately 21.94 kJ.