In exercising, a weight lifter loses 0.217 kg of water through evaporation, the heat required to evaporate the water coming from the weight lifter's body. The work done in lifting weights is 1.40*10^5 J. (a) Assuming that the latent heat of vaporization of perspiration is 2.42*10^6 J/kg, find the change in internal energy of the weight lifter. (b) Determine the minimum number of nutritional calories of food that must be consumed to replace the loss of internal energy. (1 nutritional calorie= 4186 J ).

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Calorimetry

Measuring the heat transferred during chemical reactions or other physical processes is known as calorimetry. It comes under the branch of thermochemistry.