1. The problem statement, all variables and given/known data I'm so confused please help :\ Show that the contribution to the total energy from molar internal energy Um reverts to the classical expression at high T. 2. Relevant equations Classical: Um = 3NakT Quantum Um = 3NAhv/e^(hv/kT)-1 3. The attempt at a solution Manipulating variables- E=hv Quantum rearranging: hv/kT= ln(3Nahv)-ln(Um) Very confused on what is meant by total energy though. Is that supposed to be E+Um?