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)

Given 8.10g of butanoic acid and excess ethanol, how many grams of ethyl butyrate would be synthesized, assuming a complete 100% yield?

A chemist ran the reaction and obtained 5.45g  of ethyl butyrate. What was the percent yield?

Explanation / Answer

1 mole of butanoic yield 1 mole of ethyl butyrate

so 8.10 gms of butanoic yield = 8.10 /88 = 0.92 moles

so as the yield is 100%

so the gms of ethyl butyrate = 0.92 * ml wt = .92*116 = 10.677 gms

so now when the yield is hypothetical to be

5.45 gms

so the % yield now becomes = 5.45 / 10.677 = 0.51 '*100 = 51 %

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