What about our trans compound? Let's suppose we move this ethyl group into or onto the bottom and now we have our transexane. So now no matter how much they rotate, there's no interaction between these destabilizing ethyl groups between these large ethyl groups. And that means the trans isomer is the more stable isomer because it does not have the destabilizing interaction between the two ethyl groups like in the CIS compound. Therefore, it has a lower or more negative enthalpy of formation. There is a difference of about one kilogal per mole of energy between this guy and this compound.