Answered: Stearic acid (C18H36O2) is a typical…

Chemistry: Principles and Practice

3rd Edition

ISBN:9780534420123

Author:Daniel L. Reger, Scott R. Goode, David W. Ball, Edward Mercer

Publisher:Daniel L. Reger, Scott R. Goode, David W. Ball, Edward Mercer

Chapter22: Organic Chemistry And Biochemistry

Section: Chapter Questions

Problem 86QE

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Question

Stearic acid (C18H36O2) is a typical fatty acid, a moleculewith a long hydrocarbon chain and
an organic acid group (COOH) at the end. It is used to make cosmetics, ointments,soaps,
and candles and is found in animal tissue as part of manysaturated fats. In fact, when you
eat meat, chances are that youare ingesting some fats that contain stearic acid.
(a) Write a balanced equation for the complete combustion ofstearic acid to gaseous
products.
(b) Calculate ∆H°rxnfor this combustion (∆H°f = -948 kJ/mol).
(c) Calculate the heat (q) in kJ and kcal when 1.00 g of stearicacid is burned completely.
(d) The nutritional information for a candy bar states that oneserving contains 11.0 g of fat
and 100 Calfrom fat (1 Cal =1 kcal). Is this information consistent with your answer in
part (c)?

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