1 molecule of glucoses yields 262 8 kcal of usable energy No. of glucose molecule required to produce 4800 kcal energy $= \frac{4800}{262.8} = 18$ 1 molecule of ATP yield 7.3 kcal of usable energy No. of ATP molecules required to produce 4800 kcal energy $= \frac{4800}{7.3} = 657$