The 'calorie' used in nutrition is actually a kilocalorie. Assume that a human requires 2500 cal' of energy each day for metabolic activity. What mass of ethanol is needed to provide this energy?
`C_2H_5OH (l) 3O_2(g) to 2CO_2(g) + 3H_2O(l) , Delta H = -1371kJ`
If the human body is considered to be a closed system, what would be the temperature increase resulting from this energy intake? Assume a mass of 75 kg and a specific heat of `4 J K^(-1) g^(-1)`. If the body temperature is to be maintained at a constant value by the evaporation of water, what mass of water must evaporate? Assume that the heat of vaporization of water is `44 kJ "mol"^(-1)`

Explanation

`352g, 35K day^(-1) , 4292g`