(a) When a 0.235-g sample of benzoic acid is combustedin a bomb calorimeter (Figure 5.19), the temperature rises1.642 °C. When a 0.265-g sample of caffeine, C8H10N4O2,is burned, the temperature rises 1.525 °C. Using the value26.38 kJ>g for the heat of combustion of benzoic acid, calculatethe heat of combustion per mole of caffeine at constantvolume. (b) Assuming that there is an uncertainty of 0.002 °Cin each temperature reading and that the masses of samplesare measured to 0.001 g, what is the estimated uncertainty inthe value calculated for the heat of combustion per mole ofcaffeine?
(a) When a 0.235-g sample of benzoic acid is combustedin a bomb calorimeter (Figure 5.19), the temperature rises1.642 °C. When a 0.265-g sample of caffeine, C8H10N4O2,is burned, the temperature rises 1.525 °C. Using the value26.38 kJ>g for the heat of combustion of benzoic acid, calculatethe heat of combustion per mole of caffeine at constantvolume. (b) Assuming that there is an uncertainty of 0.002 °Cin each temperature reading and that the masses of samplesare measured to 0.001 g, what is the estimated uncertainty inthe value calculated for the heat of combustion per mole ofcaffeine?
Chapter6: Thermochemistry
Section: Chapter Questions
Problem 104AE
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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?
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