When one mole of glucose releases 686 kilo calories and one mole of fat releases 9.45 kilo calories. ..where in 9.45 is less than 686 kilo calories how fat produce high energy than glucose? 

Asked by kuldipkaler123 | 6th Nov, 2015, 06:27: PM

Expert Answer:

  • The metabolism of glucose is representative of that of carbohydrates. If we begin with 1 mole of glucose (180 g) and oxidize it with 6 moles of oxygen molecules, there are 6 moles of carbon dioxide, 6 moles of water and 686 kcal of energy produced.
    • C6H12O6 + 6O2 → 6CO2 + 6H20 + 686 kcal
  • The energy produced per mass of fuel is 686 kcal/180 g glucose = 3.80 kcal/g glucose.
  • The oxidation of plamitic acid is representative of that of fatty acids (Fats → Fatty acids + Glycerol). If we begin with 1 mole of palmitic acid (256.4 g) and oxidize it with 23 moles of oxcygen molecules, there are 16 moles of carbon dioxide, 16 moles of water and 2397 kcal of energy produced.
    • CH3(CH2)14COOH + 23O2 → 16CO2 + 16H2O + 2397 kcal
  • The energy produced per mass of fuel is 2397kcal/256.4 g = 9.3 kcal/g.
  • From the above energy yields, we can say that fats produce more energy than carbohydrates. 

Answered by Sheetal Kolte | 6th Nov, 2015, 07:44: PM