Constant Volume Heat of Combustion from heat capacity of calorimeter

In summary, the Constant Volume Heat of Combustion is a measure of the energy released during complete combustion at constant volume and is typically expressed in joules per gram. It is related to the heat capacity of a calorimeter, which is used in its calculation. A constant volume calorimeter is important for accurate measurement of this parameter. It is used in the study of fuels to compare their efficiency and potential as energy sources, but may not accurately reflect the energy released in a real-life combustion process.
  • #1
aruhland
2
0
Homework Statement
A 0.009089 mol sample of an organic compound was burned in oxygen in a bomb calorimeter. The temperature of the calorimeter increased from 24.3 C to 31.1 C. If the heat capacity of the calorimeter is 4.38 kj/C, what is the constant volume heat of combustion of this compound, in kj/mol?
Relevant Equations
Qcal=heat capacity calorimeter * change in temperature
Q=nCdeltaT
Qcal=-Qrxn
Q=heat capacity calorimeter*(-)change in T*moles
=0.009089mol*-6.8C*4.38kj/C
=-0.2707kj/mol

This answer is wrong but it was the only one I could come up with right now. I just noticed units in the answer would be wrong too. Any suggestions?
 
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  • #2
Isn't heat of combustion given as a positive value?
 
  • #3
aruhland said:
Q=nCdeltaT
What do the terms in this equation mean? What are their units? Have you done your calculation correctly?
 
  • #4
Oh my, how I missed that :(
 

FAQ: Constant Volume Heat of Combustion from heat capacity of calorimeter

1. What is the constant volume heat of combustion?

The constant volume heat of combustion is the amount of heat released when a substance undergoes complete combustion at constant volume. It is typically measured in joules per mole (J/mol) or kilojoules per mole (kJ/mol).

2. How is the constant volume heat of combustion determined?

The constant volume heat of combustion is determined by conducting experiments in a bomb calorimeter. This device measures the heat released during combustion at constant volume, allowing for accurate determination of the heat of combustion.

3. What factors affect the constant volume heat of combustion?

The constant volume heat of combustion can be affected by several factors, including the type of fuel being burned, the amount of oxygen available for combustion, and the temperature and pressure conditions during the reaction.

4. Why is the constant volume heat of combustion important?

The constant volume heat of combustion is an important measurement in thermodynamics and chemistry. It is used to calculate the energy content of fuels and can also provide insight into the efficiency of combustion processes.

5. How is the constant volume heat of combustion related to the heat capacity of a calorimeter?

The heat capacity of a calorimeter is an important factor in determining the constant volume heat of combustion. The calorimeter must be well insulated and have a known heat capacity in order to accurately measure the heat released during combustion at constant volume.

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