Homework Help: college chemistry!! need help now!!

Posted by CM on Sunday, October 19, 2008 at 9:51pm.

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 water is lost from the body in 1hr? The vapor pressure of water at 37degree C is 47.1 mmHg.

college chemistry!! need help now!! - bobpursley, Sunday, October 19, 2008 at 9:55pm
How many moles of water per breath?

n=PV/RT

P=vaporpressure V is volume of breath
T is temp.

Now, knowing moles per breath, convert that to one hour. Finally convert moles water to grams water.
- college chemistry!! need help now!! - CM, Sunday, October 19, 2008 at 10:01pm
  thanks so much!! i thought it had something to do with partial pressures.
  - college chemistry!! need help now!! - bobpursley, Sunday, October 19, 2008 at 10:03pm
    actually, it does. You have to use the partial pressure of water in the equation, just as I said, and as GK said.
college chemistry!! need help now!! - bobpursley, Sunday, October 19, 2008 at 10:02pm
I am irked. GK gave you a correct answer 20 min ago, and you posted again. Besides being rude, it wastes volunteers time. Please dont do that again.
- college chemistry!! need help now!! - CM, Sunday, October 19, 2008 at 10:09pm
  sorry about that,i am just so busy.i am a really good student at chem,just had a really big doubt.the question was confusing and i thought mayb GK mistook it as well. but it wont happen again
college chemistry!! need help now!! - GK, Sunday, October 19, 2008 at 10:09pm
Your question has already been answered here:
http://Jiskha.com/display.cgi?id=1224463048

The moles of a gas in a mixture, in this case water vapor,depends on the partial pressure of that gas independently of any other gases present. That comes out of Dalton's Law of Partial Pressures. I gave you a complete procedure on how to calculate the moles of H2O vapor. The moles can be easily converted to grams. Do multiple postings of the same question will not get you a more detailed answer.
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- pufcmt xmbgaicjh - pufcmt xmbgaicjh, Wednesday, November 19, 2008 at 6:34pm
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