Pressure Question?

Question

A sample of NE gas occupies a volume of 12.0 L at STP. If the same number of Ar atoms (as there are Ne atoms in the original sample) were placed in a 24.0 L container and heated to 300K, what would the pressure inside the container be?

Answer 1

If you use STP conditions for Neon gas, then
pV=nRT, from which you can solve for n moles.
(about 0.55 or so). Then you can take n moles of Ar at 300 K and 24 liters and solve for P (about 0.6 atm).