It's doable, but you're going to burn yourself out. When the two summer sessions are over, you will feel like you had a nasty, discouraging start to your college education.
Ochem is a very dense subject. It's hard enough to compact one semester into a 5 week intensive course. To take both sessions in one 10 week marathon will be very mentally demanding. You're going to be going at a rapid pace during the in-class lecture (often several hours straight), then you're going to need to study most of the remaining waking hours of the day. Ochem is not a class where you can just 'pay attention during lecture' and ease your way through. It's a whole new way of thinking about studying and a whole new way of thinking about organizing and learning new information. As long as you know this upfront and as long as you're committed to not burning out at the end (which is nearly impossible), then you can sign up for it. Personally, I would advise you not to.
Also, Ochem is typically a 3rd and 4th semester series. Are you saying you haven't even started your 1st semester? Is there a reason you're taking sophomore level classes before starting as a freshman?