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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: y

_{i}= moles of i / total moles

Partial Pressure: P

_{i}= y

_{i}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.