Ive already checked it DrBob222 that's the problem the teacher gave. Here's the complete problem : Exhaled breathe is a mixture of Nitrogen, oxygen, carbon dioxide and water vapor. What is the partial pressure of CO2(torr) in exhaled breathe at 37.0 degree C if the partial pressure of Oxygen is 116 torrr and that of nitrogen is 659 torr. Assume the atmospheric pressure is 1.00 atm.

Question

Ive already checked it DrBob222 that's the problem the teacher gave. Here's the complete  problem : Exhaled breathe is a mixture of Nitrogen, oxygen, carbon dioxide and water vapor. What is the partial pressure of CO2(torr) in exhaled breathe at 37.0 degree C if the partial pressure of Oxygen is 116 torrr and that of nitrogen is 659 torr. Assume the atmospheric pressure is 1.00 atm.

DrBob222 · Answer

I may be missing something but
Ptotal = pCO2 + pN2 + pO2 + pH2O and I don't see anything in the problem to suggest that pO2 and pN2 should be changed to other conditions (temperature etc). BUT, and this is my problem, 659 + 116 = 775 torr which is more than the total of 760. That will make pCO2 negative and that can't be true. Perhaps another tutor can spot the problem.

carina 78 · Answer

thanks a lot

bobpursley · Answer

DrBob is correct, something is wrong with the data. I suspect it is the value of pN2 should have been typed 569, which is quite close to what is found in Earth's atmosphere.

bobpursley · Answer

http://diatronic.co.uk/nds/webpub/partial_pressures.htm