When a 0.225-g sample of benzoic acid is combusted in a bomb calorimeter, the temperature rises 1.643 °C. When a 0.260-g sample of caffeine, C8H10O2N4, is burned, the temperature rises 1.564 °C. Using the value 26.38 kJ/g for the heat of combustion of benzoic acid, calculate the heat of combustion per mole of caffeine at constant volume.

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Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
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Chapter1: Chemical Foundations
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Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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Part A
When a 0.225-g sample of benzoic acid is combusted in a bomb calorimeter, the temperature rises 1.643 °C. When a 0.260-g sample of caffeine,
C8H10O2N4, is burned, the temperature rises 1.564 °C. Using the value 26.38 kJ/g for the heat of combustion of benzoic acid, calculate the heat of
combustion per mole of caffeine at constant volume.
4220 kJ/mol
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Part B
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Correct answer is shown. Your answer 4174.5 kJ/mol was either rounded differently or used a different number of significant figures than
required for this part.
Assuming that there is an uncertainty of 0.002 °C in each temperature reading and that the masses of samples are measured to 0.001 g, what is the
estimated uncertainty in the value calculated for the heat of combustion per mole of caffeine?
Express your answer using two significant figures.
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Transcribed Image Text:Part A When a 0.225-g sample of benzoic acid is combusted in a bomb calorimeter, the temperature rises 1.643 °C. When a 0.260-g sample of caffeine, C8H10O2N4, is burned, the temperature rises 1.564 °C. Using the value 26.38 kJ/g for the heat of combustion of benzoic acid, calculate the heat of combustion per mole of caffeine at constant volume. 4220 kJ/mol Submit Previous Answers Part B Correct Correct answer is shown. Your answer 4174.5 kJ/mol was either rounded differently or used a different number of significant figures than required for this part. Assuming that there is an uncertainty of 0.002 °C in each temperature reading and that the masses of samples are measured to 0.001 g, what is the estimated uncertainty in the value calculated for the heat of combustion per mole of caffeine? Express your answer using two significant figures. ΤΟ ΑΣΦ Submit Previous Answers Request Answer ? kJ/mol × Incorrect; Try Again; 5 attempts remaining
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