1. The problem statement, all variables and given/known data Simplistically, hemoglobin can exist in 5 states (0,1,2,3 or 4 bound O2). Name each state accordingly as UB (unbound) and B1, B2, B3, and B4 (for the four bound states). Using Boltzmann's Law, write down the probability that the molecule exists in a bound form. 2. Relevant equations Here's Boltzmann's Law as I know it: Pa/Pb = 1/z * exp[Ui/KbT] where: Pa: Probability A Pb: Probability B z: partition function Ui: energy state Kb: Boltzmann's constant T: Temperature in K 3. The attempt at a solution This problem is on a study guide for an exam on Monday morning. This is tough, because the instructor did not explain very well how to use Boltzmann's Law for this sort of problem. If someone could point me in the right direction, it would be a giant help.