Yeah well... i've never seen ICl so I assumed I and Cl seperately seeing as you added a space inbetween. My bad. But only because you say entropy is decreasing. I would say this is because they are turning into pure gasses
This is just a guess, its actually very close to zero, but yeah. Also, this question is making my raise my eyebrow lol. I looked up Iodine and its boiling point is 370K. It would make much more sense if it was ICl(aq)
dG = dH-TdS. Not Spontaneous will be +/- for all temps. +/+ for low temps (or since entropy is practically 0 its nearly infinite temps.
But let's not hijack this dudes thread. PM me if you don't get it