Consider the following two conformations of 2,3-dimethylbutane. For each of these conformations, use the following table to determine the total energy cost associated with all torsional strain and steric strain.

(a)

(b)

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ENERGY COSTS FOR COMPARING THE RELATIVE ENERGY OF CONFORMATIONS ENERGY COST (K./ MOL) INTERACTION TYPE OF STRAIN Torsional strain Нн H/H Eclipsed Torsional strain НСHЗ CH3/H Eclipsed Torsional strain + steric Нас Сн 11 hindrance CH3/CH3 Eclipsed Steric hindrance 3.8 CH3 CH3 CH3/CH, Gauche CHз CHз Н. 13 H- CHз CHз