Question

An athlete is given 180g of glucose. he utilises 50% of the energy due to internal combustion in the body. in order to avoid storage of energy in the body,calculate the mass of water he would need to perspire. given enthalpy of combustion of glucose is -2800 kj mol⁻¹ and enthalpy of evaporation of water is 44 kj mol⁻¹

Answer 1

To calculate the mass of water that an athlete would need to perspire in order to avoid storage of energy in the body, we need to determine the energy released by the combustion of glucose and the heat required to evaporate water.

Step-by-step explanation:

To calculate the mass of water that an athlete would need to perspire in order to avoid storage of energy in the body, we need to determine the energy released by the combustion of glucose and the heat required to evaporate water.

The energy released by the combustion of glucose can be calculated using the enthalpy of combustion of glucose (-2800 kJ/mol) and the amount of glucose given (180g). The energy released is equal to the enthalpy of combustion multiplied by the number of moles of glucose, which can be obtained by dividing the mass of glucose by its molar mass.

The heat required to evaporate water can be calculated using the enthalpy of evaporation of water (44 kJ/mol) and the amount of water needed to be perspired. Assuming sweat is mostly water, we can estimate the amount of water perspired.