An English chemistry professor needs a cup of hot tea before grading 50 homework assignments but his electric water heater is broken . In his lab, however, he does have some ethanol (CH3CH2OH, MW=46.07gmol-1 ) and 1 gram of benzoic acid (C6H5COOH, MW=122.12 gmol-1 ). He knows that the benzoic acid has an enthalpy of combustion, H, of -3226.7 kJmol-1 . In a constant volume (bomb) calorimeter initially at 293.15 K, he finds that the combustion of 1.000 g of benzoic acid increased the temperature to 297.67 K. In the exact same calorimeter, 1.000 g of ethanol raised the temperature from 293.15K to 298.38K. (a) What is the enthalpy of combustion for 1 mole of ethanol?

Physical Chemistry
2nd Edition
ISBN:9781133958437
Author:Ball, David W. (david Warren), BAER, Tomas
Publisher:Ball, David W. (david Warren), BAER, Tomas
Chapter2: The First Law Of Thermodynamics
Section: Chapter Questions
Problem 2.83E: Benzoic acid, C6H5COOH, is a common standard used in bomb calorimeters, which maintain a constant...
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An English chemistry professor needs a cup of hot tea before grading 50 homework
assignments but his electric water heater is broken . In his lab, however, he does
have some ethanol (CH3CH2OH, MW=46.07gmol-1
) and 1 gram of benzoic acid
(C6H5COOH, MW=122.12 gmol-1
). He knows that the benzoic acid has an enthalpy
of combustion, H, of -3226.7 kJmol-1
. In a constant volume (bomb) calorimeter
initially at 293.15 K, he finds that the combustion of 1.000 g of benzoic acid
increased the temperature to 297.67 K. In the exact same calorimeter, 1.000 g of
ethanol raised the temperature from 293.15K to 298.38K.
(a) What is the enthalpy of combustion for 1 mole of ethanol?

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