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I am stuck on my design project until I find out the internal pressure of 4cc of Hexafluorobenzene inside a small ampoule at 250C. I am willing to pay for someone to work with me on that and other tracer materials.

RE: Hexafluorobenzene

Sorry, just found out that Tc for this compound is 244degC, so the fluid is either superheated vapor or dense phase at 250degC - so the Antoine constants dont help.

I'd be wary of using the SRK or virial equation to derive this pressure, given its structure. Will write back if I find something that will help.

RE: Hexafluorobenzene

On page 2-356 of Perry 7th edn, reference is made to the API Technical Data Book for Pr > 1.0, which relies on the Pitzer corresponding states model.
But first, you'll have to determine if this ampoule will indeed go into dense phase ( Pr >1.0). The NIST link should help with calculating Zc for this - since this is a student posting (?), you'll have to figure this out yourself.

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