[JennyT]

I have this question on my homework, and I can't figure out how to do it after hours 


Here is the question:
The normal respiratory rate for a human being is 15 breaths per minuter. The average volume of air for each breath is 505 cm3 at 20 Celsius and 9.95 X 10^4 Pa. What is the volume of air at STP that a person breathes in one day? (convert to cubic meter)


I know it gives me the volume and the temperature, but I get stuck with the pressure and STP thing. The result I get is very weird, and my teacher says it has to be 9.98 m3

Please help me, thanks in advange

[enahs]

PV=nRT

You know P, V, R and T in the first condition (one breath). Solve for n (number of moles in one breath).

In the second condition, STP, you now know P, R, T and n. Solve for V. Remember, this is just for one breath. How many breaths are there in a day?