An adult inhales approximately 12 times per minute, taking in about 500. mL of air per breath. Oxygen and carbon dioxide are exchanged in the lungs, but no nitrogen is exchanged. The exhaled mole fraction of nitrogen is 0.75 and is saturated with water vapor at body temperature 37°C. The ambient conditions are 25°C and 50% relative humidity. What volume of liquid water (mL) would need to be consumed to over a two-hour period to replace the water loss from breathing?
