Give the total number of degrees of freedom and calculate molar internal energy and molar heat capacity for Xe, HCl, C2H2, H20, C6H6 and cyanocobalamin (vitamin b12) at 298 K assuming all energy levels are populated. Next calculate molar internal energy and molar heat capacity assuming vibrational energy levels are not significantly populated at 298 K and do not contribute to molar heat capacity and molar internal energy. Calculate percent error for each molar heat capacity to compare quality of these two models