(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?

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