At room temperature, 2-methylbutane exists primarily as two alternating conformations of rotation about the C2-C3 bond. About 90% of the molecules exist in the more favorable conformation and 10% in the less favorable one. (a) Calculate the free energy change (△G°, more favorable conformation - less favorable conformation) between these conformations, (b) Draw a potential-energy diagram for rotation about the C2-C3 bond in 2-methylbutane. To the best of your ability, assign relative energy values to all the conformations on your diagram, (c) Draw Newman projections for all staggered and eclipsed conformers in (b) and indicate the two most favorable ones.