A person eats a container of yogurt. The Nutritional Facts label states that it contains 195 Calories (1 Calorie = 4186 J). What mass of perspiration would one have to lose to get rid of this energy? At body temperature, the latent heat of vaporizaiton of water is 2.42 106 J/kg.
Divide the heat content of the food (195x4186 = 816,300 J)
by the latent heat of vaporization 2.42*10^6 J/kg
The answer will be in kg.