People partially cool themselves by sweating, which releases water that evaporates. If during exercise a human "burns" 1000 kcal(4184 kJ) in one hour of exercise, how many grams of water must evaporate at a body temperature of 37 degree celsius?
Assuming only 75 percent of the sweat evaporates (the rest being retained by the exercise clothes), how many grams of sweat must actually be produced?
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