I don't know what you're supposed to use (what are you studying in the chapter) but one way to do it is this.
Look up dHvap and dSvap, then
dG = dH - TdS
Since dG = 0 at the boiling point, then
T = dHvap/dSvap
estimate the normal boiling point of Pcl3
answer: 333 K how do you get it?
4 answers
what is dHvap?
is it 306.4/33.2?
im confused i found those as the standard enthalpies and entropies for pcl3? i cant get answer