Trouble Solving Volume of Condensed Water

[kapatter]

I'm having some trouble getting started on this one:

3.00×10^4 cm^3 of 300 degrees C steam at a pressure of 10.0 atm is cooled until it condenses. What is the volume of the liquid water? Give your answer in cm^3.

I figure you use pV=nRT to solve. I've been trying to rearrange it, but am confused. Any help would be greatly appreciated. Thanks.

 

[Hootenanny]

Firstly, why is this is Quantum Physics?

Secondly, why don't you show us the equation that you get when you rearrange it?