Calorimetry: A jogger is running outdoors on a cold day when the temperature is -20.0°C. She is breathing at the rate of 25 breaths per minute, and each time she breathes in she inhales 0.00450 m3 of air. How much heat does she lose from breathing during 20.0 minutes of jogging if the air in her lungs is heated to her body temperature of 37.0°C before it is exhaled? The specific heat of air is 1020 J/kg ? K and the density of air under typical conditions is 1.29 kg/m3.
A. 169 kJ
B. 278 kJ
C. 354 kJ
D. 431 kJ
E. 543 kJ
Answer: A
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