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Hydrolysis of pentyl butanoate using sodium hydroxide produces an alcohol and the salt of the carboxylic acid - Scottish Highers Chemistry - Question 4 - 2017
Question 4
Hydrolysis of pentyl butanoate using sodium hydroxide produces an alcohol and the salt of the carboxylic acid. (i) Name the alcohol that would be formed when pentyl... show full transcript
Worked Solution & Example Answer:Hydrolysis of pentyl butanoate using sodium hydroxide produces an alcohol and the salt of the carboxylic acid - 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 butanoic acid is represented as:
O
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Na^+--C--C--C--C--OH
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H H H H H
Here, Na^+ indicates the sodium ion and the rest depicts the butanoate structure.
Step 4
Step 5
Calculate the energy released, in kJ, by combustion of 10 grams of stearic acid.
Answer
To calculate the energy released from the combustion of 10 grams of stearic acid, we need to determine moles of stearic acid:
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Calculate the moles of stearic acid:
ext{Molar mass of stearic acid (C17H34COOH)} = 284 ext{ g/mol}
moles = rac{10 ext{ g}}{284 ext{ g/mol}} ext{ = 0.0353 mol}
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Calculating energy:
623 ext{ kJ/mol} imes 0.0353 ext{ mol} ext{ = 22.0 kJ}
Therefore, the energy released by combustion of 10 grams of stearic acid is approximately 22.0 kJ.