Enthalpy of Combustion - VOC's 1

[NeedAHoliday]

Could someone please point me in the direction of a good comprehensive source of Enthalpy of Combustion values for hydrocarbons (VOC's, aldehydes and ketones etc).

Have no problem with the standard ones but having some difficulty in finding values of compounds such as dibenzofuran, Fluoranthene etc.

Your feedback is much appreciated.

 

[25362]

For the two PNA mentioned, the NIST webbook gives the standard heats of combustion (starting from 25 deg C and 1 atm. and back). The site:

http://webbook.nist.gov/chemistry

dibenzofuran (solid): 5836.3 +/- 4.7 kJ/mol (MW:168.19)
fluoranthene (solid): 7915.2 +/- 0.4 kJ/mol (MW:202.25)

 

[NeedAHoliday]

25362,

Thankyou, but I should have expanded further on my request, the old adage of provide all the information so that we can provide more accurate responses seems to rear its head once more.

I have been able to source some data for solid phase but I am struggling to find the data for the gas phase, i.e. gas phase/vaporised dibenzofuran calorific data etc.

 

[25362]

If we follow the instructions given by the CRC Handbook of Chemistry and Physics on the item tiled Heats of Combustion, the estimated standard enthalpies of combustion of the gaseous forms would be:

C₁₂H₈O: 393.51(12)+142.95(8)+83.4 = 5949.1 kJ/mol
C₁₆H₁₀: 393.51(16)+142.95(10)+292 = 8017.7 kJ/mol

83.4 and 292 are the standard heats of formation of the gases.

 

[NeedAHoliday]

Thank you 25362, will explore this reference a little further than I have to date.

Cheers.

 

[Calorimeters]

Dear 25362,

In your Jul 5, 2004 posting, you use the numbers 393.51 for C and 142.95 for H. I am not following you at some point. Where did these numbers come from?

Thank you for the clarification.

 

[25362]

Calorimeters, those are the standard heats of combustion for Carbon (graphite) and for the gaseous Hydrogen molecule divided by 2.