An average healthy man needs about 10000 kJ of energy per day. How much carbohydrates (in mass) he will have to consume assuming that all this energy needs are met only by carbohydrates in the form of glucose? The enthalpy of combustion of glucose is 2816 kJ /mol.
Enthalpy of combustion of glucose = 2816 kj /mol
Molecular mass of glucose = = 6x12 + 12x1 + 6x16 = 180 g/ mol
2816 kj of energy is evolved from glucose = 180 g 10000 kj of energy will be evolved from glucose
=180 / 2816 x 10000 = 639.20 g