Energy available for sustaining Eric's muscular and nervous activity can be calculated by,
Energy available= Standard molar entropy×Number of moles×Temperature
We have, standard molar entropy of glucose = 182 J/K mol
Number of moles of glucose = 1.80 mol
Body temperature = 36.9° C = 36.9 + 273.15 = 310.05 K
Substituting the value we get,
Energy available = 182×1.80×310.05 = 100,456.2 J