An athlete is given 100 g of glucose for energy. This is equivalent to 1800 kJ of energy. The 50% of this energy gained is utilized by the athlete for sports activities at the event. In order to avoi

Question

An athlete is given 100 g of glucose  for energy. This is equivalent to 1800 kJ of energy. The 50% of this energy gained is utilized by the athlete for sports activities at the event. In order to avoid storage of energy, the weight of extra water he would need to perspire is  g (Nearest integer)

Assume that there is no other way of consuming stored energy.

Given: The enthalpy of evaporation of water is 
Molar mass of C, H & O are 12, 1 and 16 .

Canvas Classes · Accepted Answer

Step 1: Calculate energy to be dissipated

Total energy from 100 g glucose = 1800 kJ
Energy used for sports (50%) = 900 kJ
Energy remaining to be dissipated = 1800 − 900 = 900 kJ

Step 2: Calculate moles of water needed to evaporate

Enthalpy of evaporation of water = 45 kJ/mol

Step 3: Calculate mass of water

Final Answer: 360 g

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