Sakura L.

asked • 14d

evaluate the chemical formula

Fatty acids have a general formula of CxHyOz. A technician wants to determine the type of pure fatty acid isolated from a metabolite mixture. As 16.71g of the pure fatty acid is fully combusted under oxygen (o2), it decomposes according to the below chemical equation.

CHO(l)+O2(g)-->CO2(g)+H2O(l)

It is found that only 46.33g carbon dioxide (CO2) and 16.43g water (h2o) were obtained as the products. It is also known that the molecular weight of the fatty acid is 238 g/mol. (a) Please evaluate the chemical formula of the fatty acid.

2 Answers By Expert Tutors

By:

J.R. S.

tutor
@Dr. Bob: I think you made an error in calculating grams of O (subtraction error).
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14d

Robert S.

tutor
Yes. Thanks JRS. I'll fix that now.
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14d

Robert S.

tutor
J.R. S. - Thanks for pointing that out. I had the correct calculation on my spreadsheet, but erred in transcribing it. I rounded the atomic masses a little too much, which accounts for some additional H atoms that I wished weren't there to rweach the correct molar mass. Your answer shows the calculation correctly [To others - see the answer by J. R.S]
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14d

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