Question

Given handbook std enthalpies of formation at 298K for C5H10 (liq)=-105.9 kJ/mol and C5H10 (g)=-77.2 kJ/mol, estimate the normal boiling point of cyclopentane.

I calculated delta H (vap or rxn) to be +28.7 kJ/mol. I am not sure how to proceed from here. Thank you very much for your help.

Answer 1

I figured it out....you use Trouton's rule of delta Svap is approx 88 J mol-1K-1 for normal bps of liquids.....you get 326K.