Exp 4. Results Benzoic Acid Champi Sample Weight of sample 0.4997 g 0.4107 g Pressure in the container 3000 kPa 3000 kPa Measured heat of combustion 26.28 kJ/g or 6.281 kcal/g 11.74 kJ/g or 2.806 kcal/g Table 1. Parameters obtained during the determination the heat of combustion of the sample. a. Calculate the calorific value of the sample in KJ, kcal and cal units. b. Cite the advantages and disadvantages between constant-pressure and constant-volume calorimeter. c. When 3.12 g of glucose, C6H12O6, is burned in a bomb calorimeter, the temperature of the calorimeter increases from 23.8 °C to 35.6 °C. The calorimeter contains 775 g of water, and the bomb itself has a heat capacity of 893 J/°C. How much heat was produced by the combustion of the glucose sample?

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Exp 4.

Results

 

Benzoic Acid

Champi Sample

Weight of sample

0.4997 g

0.4107 g

Pressure in the container

3000 kPa

3000 kPa

Measured heat of combustion

26.28 kJ/g or 6.281 kcal/g

11.74 kJ/g or 2.806 kcal/g

Table 1. Parameters obtained during the determination the heat of combustion of the sample.

a. Calculate the calorific value of the sample in KJ, kcal and cal 
units.

b. Cite the advantages and disadvantages between constant-pressure and constant-volume calorimeter.

c. When 3.12 g of glucose, C6H12O6, is burned in a bomb 
calorimeter, the temperature of the calorimeter increases from 23.8 °C to 35.6 °C. The calorimeter contains 775 g of water, and the bomb itself has a heat capacity of 893 J/°C. How much heat was produced by the combustion of the glucose sample? 

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