# Physics

posted by Victor

A person takes about 20 breaths per minute with 0.5 litre of air in each breath. How much heat is removed per hour by the moisture in the exhaled breath if the incoming air is dry and the exhaled breath is fully saturated? Assume that the water vapour pressure in the saturated exhaled air is 24 torr.

1. drwls

That's 10 liters of air per minute. If the partial pressure of exhaled H2O is 24 torr, the number of moles of water (at 20 C and 1 atm) is
(10/24)*24/760 = 1.32*10^-2 moles
which has a mass of 0.237 g. Multiply that by 60 for the mass loss per hour. It's about 14.2 g.

For heat removal, multiply that by the heat of vaporization of H2O

## Similar Questions

1. ### Chemistry

If it takes three "breaths" to blow up a balloon to 1.2 , and each breath supplies the balloon with 0.060 moles of exhaled air, how many moles of air are in a 3.0 balloon. Express your answer in moles using two significant figures …
2. ### Chemistry

If it takes three "breaths" to blow up a balloon to 1.2 , and each breath supplies the balloon with 0.060 moles of exhaled air, how many moles of air are in a 3.0 balloon. Express your answer in moles using two significant figures …
3. ### college Chemistry

An adult takes about 15 breaths per minute, with each breath having a volume of 500mL. if the air that is inhaled is "dry", but he exhaled air is 1 atm pressure is saturated with water vapor at 37 degree C(body temp), what mass of …
4. ### college chemistry!! need help now!!

An adult takes about 15 breaths per minute, with each breath having a volume of 500mL. if the air that is inhaled is "dry", but the exhaled air at 1 atm pressure is saturated with water vapor at 37 degree C(body temp), what mass of …
5. ### chemistry

a resting person requires 14.5 L of O2 per hour to maintain metabolic activities. Such a person breathes in 0.50 L of air at approximately 20 degrees C with each breath. The inhaled air is 20.9%O2 while the exhaled air is 16.3% O2. …
6. ### physics

A resting person requires 14.5 L of oxygen per hour to maintain metabolic activities. Such a person breathes in 0.480 L of air at approximately 25.0 degrees celsius with each breath. The inhaled air is 20.9% while the exhaled air is …
7. ### chemistry

each time you breath in, you take in 500 ml of air. the air you breath in is about 20% oxygen by volume. you breath roughly 8 times per minute when you sleep and lets assume you sleep for 8 hours in a night. given this information, …
8. ### Chemistry Help

If it takes three "breaths" to blow up a balloon to 1.2 L, and each breath supplies the balloon with 0.060 moles of exhaled air, how many moles of air are in a 3.0 L balloon?
9. ### Chemistry

If 74.5% of exhaled air is nitrogen, what is the partial pressure of nitrogen in exhaled air. Assume that the total pressure of exhaled air is 760 mmhg.
10. ### General Chemistry

A typical human adults exhales 500 mL of air per breath. At this rate, calculate the volume of air exhaled after 20 breaths in units of cubic meters.

More Similar Questions