Answered: Stirrer Sample ignition wires…

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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Question

(a) When a 0.235-g sample of benzoic acid is combusted
in a bomb calorimeter (Figure 5.19), the temperature rises
1.642 °C. When a 0.265-g sample of caffeine, C₈H₁₀N₄O₂, is burned, the temperature rises 1.525 °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. (b) 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?

Stirrer
Sample
ignition wires
-Thermometer
-Insulated
container
-Bomb (reaction
chamber)
-Water
-Sample
A Figure 5.19 Bomb calorimeter.

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