During mild exercise (e.g., walking) a person breathes in air at the rate of 20 liters/min and has a metabolism rate of 300 W. Atmospheric air is at 20 °C and 30% relative humidity, and the “air” leaving the mouth is at 35 °C and 80% relative humidity. Determine the following:

A. The energy loss from a person due to breathing (W)

B. The energy-transfer rate (W) to the dry air that is breathed

C. The water loss (kg/min) from a person due to breathing