Calculating Gibbs Free Energy w/o Standard Entropy

[bg93]

This is for my Chemical Engineering class, but it comes down to a thermodynamics question. I need to calculate the gibbs free energy for a few reactions, problem is some of the compounds (1-Buten-3-yne and Styrene) do not have standard entropy values that I can find. Without a standard entropy I cannot calculate the gibbs free energy as a function of temperature. I know they have to be out thre somewhere but I cannot find after extensive googling. Can anyone point me in the right direction?

 

[UltrafastPED]

Try looking for "physical and chemical data" for the families of interest.

I quickly found this one: http://www2.ucdsb.on.ca/tiss/stretton/database/organic_thermo.htm

 

[bg93]

Sweet, that got me Styrene (I was actually previously there when I was looking for 1-Buten-3-yne).

Is there no way to calculate standard entropy knowing the specific heat/heat capacity or enthalpy?

I still can't find 1-Buten-3-yne. All the links are purple!

 

[Chestermiller]

You should really be looking directly for the free energies of formation rather than the entropies of formation. There is a table of free energies of formation in Perry's Chemical Engineers' Handbook. Another possible source is TRC Thermodynamic Tables, Hydrocarbons, Thermodynamics Research Center, Texas A & M, also, Journal of Physical and Chemical Reference Data, 11, supp.2, 1982.

 

[bg93]

Found it through that, thank you very much, that's exactly what I was looking for!