Ethyl butyrate, CH3CH2CH2CO2CH2CH3, is an artificial fruit flavor commonly used

Question

Ethyl butyrate, CH3CH2CH2CO2CH2CH3, is an artificial fruit flavor commonly used in the food industry for such flavors as orange and pineapple. Its fragrance and taste are often associated with fresh orange juice, and thus it is most commonly used as orange flavoring. It can be produced by the reaction of butanoic acid with ethanol in the presence of an acid catalyst (H+): CH3CH2CH2CO2H(l)+CH2CH3OH(l)H+CH3CH2CH2CO2CH2CH3(l)+H2O(l)

The chemist discovers a more efficient catalyst that can produce ethyl butyrate with a 78.0% yield. How many grams would be produced from 7.65 g of butanoic acid and excess ethanol? Express your answer in grams to three significant figures.

Explanation / Answer

Balanced equation:
CH3CH2CH2CO2H(l) + CH3CH2OH(l) ===> CH3CH2CH2CO2CH2CH3(l) + H2O(l)

Molar mass of butanoic acid = 88.10 g/mol

Molar mass of ethyl butyrate = 116.15 g/mol

7.65 g of butanoic acid = 7.65/ 88.10= 0.086828 Moles

Moles of ester to be produced = 0.086828 Moles

Mass of ethyl butyrate for 100 % yield = 0.086828 x 116.15 = 10.085 g

Mass of ethyl butyrate for 78 % yield = 10.085 x 78 /100 = 7.866 gm

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