Partial Pressure of Air

  • Thread starter Ahalp
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  • #1
Ahalp
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Homework Statement



A cylinder contains 1 L of air at 10 atm and 298 K.
Knowing that air is composed of 79% N2 and 21% O2 by VOLUME, calculate the initial partial pressure for both.

Homework Equations



Ideal Gas Law: PV = nRT

Mole Fraction: yi = moles of i / total moles

Partial Pressure: Pi = yi P

The Attempt at a Solution



The main thing throwing me off is that the composition is by Volume, not mass or moles.
I'm completely stumped on how to find the mole fractions.
 

Answers and Replies

  • #2
Borek
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What does Avogadro's law say about moles & volumes?
 
  • #3
Ahalp
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1 mol of every gas occupies the same volume (at the same pressure and temperature).

Thanks, it makes sense now :)
 

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