[o1ocups]

H₂(g) --> 2H(g)

Is it even spontaneous? I feel like it's not but I don't know. Maybe only under high temperatures?

[Loyal]

Let me ask it this way. 

How likely is it that at room temperature a bond between two hydrogens (Which hydrogen is diatomic at room temp) will instantly snap and the two atoms will fly apart becoming highly reactive radicals that will attack nearly anything they touch?

[o1ocups]

OK hahasyeah that makes sense. So if it's the other way around it's spontaneous at all temperatures right?

[Loyal]

OK hahasyeah that makes sense. So if it's the other way around it's spontaneous at all temperatures right?

I wouldn't quite say all temperatures without doing a little math, but frankly I would imagine you would have a hard time finding a temperature where it isn't spontaneous.